Which is which, Joe?
1. "He threw the bottle out the window." or,
2. "He threw the bottle out of the window."
The second construction is correct: "He threw the bottle out of the window." In that sentence, the preposition "of" is a must to link the noun "window" properly as the object of the preposition in the sentence. The first construction without the preposition "of" fails to establish that link--although some people to tend to use this construction colloquially in their conversations.
3. Some people say, "She smiled at me." others say,
"She smiled to me."
The first construction is the grammatically correct one: "She smiled at me."
The second construction is grammatically defective and might give people the impression that the speaker is uneducated.
4.Read yesterday in one of the online major papers:
"Mang Pepe, who I chatted with for a bit..." or should it be,
"Mang Pepe, with whom I had a chat..."
It should be "Mang Pepe, with whom I had a chat..." Here, the relative pronoun "whom" is the object of the preposition "with." One way to avoid using "whom" (some people are allergic to using it or don't know how to use it properly) is to put the sentence in the nominative case: Mang Pepe and I chatted for a bit..."
The form "Mang Pepe, who I chatted with for a bit..." is grammatically defective because it wrongly uses the subjective form "who" instead of its correct objective form "whom."