Surely one of the most slippery grammar trippers we’ll encounter in English is choosing between “like” and “such as” to form comparative statements or give examples. Which of them, for instance, is correctly used in the following two sentences?

(1) “Exemption from flight pre-boarding procedures like a thorough body search is usually granted to diplomats.”

(2) “Exemption from flight pre-boarding procedures such as a thorough body search is usually granted to diplomats.”

If you still haven’t figured out the correct usage, you may take comfort in the fact that you’re not alone in the predicament. The use of “like” and “such as” is actually considered correct in both sentences, but the choice between them has remained debatable all these years. We therefore need to carefully study both sides of the debate so we can put ourselves on more solid semantic footing regarding the usage.

Some grammarians insist that “such as,” which means “for example,” is the only correct usage in such constructions: “Exemption from flight pre-boarding procedures such as a thorough body search is usually granted to diplomats.” They maintain that “like” should never be used as a substitute for “such as,” arguing that “like” doesn’t convey the idea of giving an example at all. Instead, they say, “like” in this usage can only imply similarity, resemblance, or comparison, as in “Her pillow lips look like Angelina Jolie’s.”

Other grammarians are not as restrictive in their prescription for using “like” and “such as,” but they do recommend the following more precise usage for them:

(1) Use “such as” to introduce one or more examples that represent a larger subject, as in “Eduardo has a collection of vintage cars such as the 1955 BMW 507 and the 1915 Vauxhall”; and

(2) Use “like” to convey the idea that two subjects are comparable, as in “Alberto wants to be a vintage car collector like Ramon.”

Take note, though, that those same grammarians consider “like” to be a close semantic equivalent of “such as.” They are therefore not averse to substituting “like” for “such as” in the sentence given in Item 1: “Eduardo has a collection of vintage cars like the 1955 BMW 507 and the 1915 Vauxhall.”

On the other hand, they would find it unthinkable for anyone to substitute “such as” for “like” in the sentence given in Item 2 above. To them, the resulting sentence is unacceptable because it isn’t natural sounding or idiomatic: “Eduardo wants to be a vintage car collector such as Ramon.”

At any rate, “like” in modern spoken English has practically taken over the role of “such as” in comparative statements. The forms “such as” and “such...as” are now largely confined to formal writing. “Like,” in contrast, is now the preferred form for informal usage in which the example being given is offered not simply as an example but as the topic of the sentence itself, as in this case: "We are delighted to have a generous benefactor like Bill Gates." Using “such as” instead of “like” in such sentences must be firmly avoided, for it gives the sentence a false ring: “We are delighted to have a generous benefactor such as Bill Gates.”

In formal writing, we are well advised to distinguish carefully between “like” comparisons and “such as” comparisons. In a “like” comparison, only one person or object from the class is usually named, and that person or object is understood to be excluded from the group being discussed.

Take this example: “If you are a student taught by a brilliant mathematics teacher like Prof. Alberto Reyes, you would learn differential calculus in no time at all.” This comparison is about the possibility of students being taught by mathematics teachers whose brilliance is comparable to Prof. Alberto Reyes’s, with Prof. Reyes himself specifically excluded from the comparison.

On the other hand, in a “such as” or “such...as” comparison, one or several persons or objects can be named in the comparison, and all of those persons or objects are understood to be included in the group being discussed.

Take these two sentences:

“With highly capable mathematics professors such as Prof. Alberto Reyes and Prof. Eduardo Cariño handling the differential calculus classes, we can expect a much higher percentage of passing among the students.”

“With such highly capable mathematics professors as Prof. Alberto Reyes and Prof. Eduardo Cariño handling the differential calculus classes, we can expect a much high percentage of passing among the students.”

In both sentences, the comparison this time is about brilliant mathematics teachers as a class whose members include both Prof. Reyes and Prof. Cariño.

Now that we know how to clearly distinguish the semantic difference between “like” and “such as,” we should be able to use them from now on without fear of tripping in our grammar. (September 26, 2005)

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From the weekly column “English Plain and Simple” by Jose A. Carillo in The Manila Times, September 26, 2005 © 2005 by the Manila Times Publishing Corp. All rights reserved.

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Part III:

We have already taken up the two basic rules for parallel construction, namely that a sentence that presents two or more serial elements should stick to the same pattern all throughout, and that a parallel structure that begins with a clause should sustain that pattern all the way. We saw that we can build much clearer and more forceful sentences by consistently observing these rules.

Now we need to refami­liarize ourselves with four specific applications of these two parallelism rules: (1) that all of the elements being enumerated in a list should take the same grammatical form, (2) that elements being compared should take the same grammatical form, (3) that elements joined by a linking verb or a verb of being should take the same grammatical form, and (4) that elements joined by a correlative conjunction should take the same grammatical form.

All elements in a list should have a parallel structure. We can make our written compositions better organized and more readable by using the same grammatical form for all the elements we are enumerating in a list. The elements should all be noun forms, verb forms, infinitive phrases, gerund phrases, or participial phrases, whichever is most appropriate. When we allow any of the elements to take a different form, the rhythm of the enumeration is broken and the reader’s train of thought is needlessly disrupted.

Consider the following not-so-well-thought-out list:

“At present, our club has: (1) no formal charter, (2) subsisting without a long-term organizational goal, (3) a seriously declining membership, (4) a large budgetary deficit, and (5) to collect a large amount of past-due membership fees.”

The list looks awfully craggy and reads very badly for an obvious reason: its elements don’t follow a consistent grammatical form. Items 1, 3, and 4 are noun phrases, but Item 2 is a verb phrase in the progressive form and Item 5 is an infinitive phrase. 

Now see how smoothly and cohesively the list reads when its elements all take the same grammatical form, in this case as verb phrases:

“At present, our club: (1) lacks a formal charter, (2) subsists without a long-term organizational goal, (3) suffers from a seriously declining membership, (4) carries a large budgetary deficit, and (5) needs to collect a large amount of past-due membership fees.”

Elements being compared should use a parallel structure. In constructions that use the form “X is better than/more than Y,” we have to make sure that the elements being compared have the same grammatical structure. Unparallel (gerund/infinitive):“She enjoys jogging better than to run.” Parallel (gerund/gerund): “She enjoys jogging better than running.”

Elements joined by a linking verb or a verb of being should use a parallel structure. When we use “is” as a verb of being that links two elements, we have to make sure that the elements have the same grammatical structure. Unpa­rallel (infinitive/gerund):“To make that impossible demand is declaring open hostilities.” Parallel (infinitive/infinitive):“To make that impossible demand is to declare open hostilities.” 

Elements joined by a correlative conjunction should use a parallel structure. When we use the correlative conjunctions “either . . .  or,” “neither . . . nor,” “not only . . . but also,” “both . . . and . . .”, and “whether . . . or,” we have to make sure that the elements being correlated have the same grammatical structure.

Unparallel (gerund/infinitive): “For you to get to Manila on time, we suggest either taking the morning flight tomorrow or to drive overnight right now.” Parallel (gerund/gerund): “For you to get to Manila on time, we suggest either taking the morning flight tomorrow or driving overnight right now.”

Unparallel: “They not only demand very short installment periods but also huge down payments.” Parallel: “They demand not only very short installment periods but also huge down payments.” Also parallel: “They not only demand very short installment periods but also demand huge down payments.”

We will take up some more fine points about parallelism in Part IV of this essay. (June 12, 2006)

Part IV:

We saw in the first three parts of this essay that the consistent use of parallel structures is the key to more readable, more forceful, and more polished sentences. We also learned that for clearer and more cohesive sentences, we should always use parallel structures when presenting various elements in a list, when comparing elements, when joining elements with a linking verb or a verb or being, and when joining elements with correlative conjunctions.

Before winding up our discussions on parallel construction, we will take up two more techniques for harnessing parallelism to give structural balance and better rhythm to our sentences. We will discover that these techniques can dramatically improve our writing and give it a distinctive sense of style.

Use parallel structure for adjectives and adverbs. We should also aim for parallel patterns when using adjectives and adverbs in our sentences, seeking structural balance for them in much the same way as we do for noun forms, verb forms, infinitives, and gerunds.

Unparallel construction: “She danced gracefully, with confidence and as if exerting no effort at all.” Here, we have a stilted sentence because the modifiers of the verb “danced” have taken different grammatical forms: “gracefully” (adverb), “with confidence” (adjective introduced by a preposition), and “as if exerting no effort at all” (adverbial phrase).

Parallel construction: “She danced gracefully, confidently, effortlessly.” The consistent adverb/adverb/adverb pattern gives the sentence a strong sense of unity and drama.

Unparallel construction: “The gang attempted an audacious bank robbery that was marked by lightning speed and done in a commando manner.” The sentence reads badly because the three modifiers of “bank robbery” are grammatically different: “audacious” (adjective), “marked by lightning speed” (participial phrase), and “done in a commando manner” (another participial phrase).

Parallel construction: “The gang attempted an audacious, lightning-swift, commando-type bank robbery.” The sentence reads much more forcefully because of its consistent adjective-adjective-adjective pattern for all of the modifiers of “bank robbery.”

Use parallel structure for several elements serving as complements of a sentence. For more cohesive and forceful sentences, we should always look for a suitable common pattern for their complements. Recall that a complement is an added word or expression that completes the predicate of a sentence. For instance, in the sentence “They included Albert in their soccer lineup,” the phrase “in their soccer lineup” is the complement.

Unparallel construction: “We basked in the kindness of our gracious hosts, walking leisurely in the benign morning sunshine, and the palm trees would rustle pleasantly when we napped in the lazy afternoons.” Here, we have a confusing construction because the three elements serving as complements don’t have a common grammatical pattern: “the kindness of our hosts” (noun phrase), “walking leisurely in the benign morning sunshine” (progressive verb form), and “the palm trees would rustle pleasantly when we napped in the lazy afternoons” (clause).

Parallel construction: “We basked in the kindness of our gracious hosts, in the benign sunshine during our early morning walks, and in the pleasant rustle of the palm trees when we napped in the lazy afternoons.” The sentence reads much, much better this time because the three complements are now all noun phrases in parallel—“in the kindness of our gracious hosts,” “in the benign morning sunshine during our early morning walks,” and “in the pleasant rustle of the palm trees when we napped in the lazy afternoons.” Note that all three have been made to work as adverbial phrase modifiers of the verb “basked.”

In actual writing, of course, the need to use parallel structures in our sentences will not always be apparent at first. As we develop our compositions, however, we should always look for opportunities for parallel construction, choose the most suitable grammatical pattern for them, then pursue that pattern consistently. Together with good grammar, this is actually the great secret to good writing that many of us have been looking for all along. (June 19, 2011)

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From the weekly column “English Plain and Simple” by Jose A. Carillo in The Manila Times, June 12 and 19, 2006 © 2006 by the Manila Times Publishing Corp. All rights reserved.

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