I'm an English learner. While I was reading a novel, one question that I never tried to resolved appeared and then I decided that time for a resolution was indispensable. Which phrase is correct: "They are the officers you need to respect" or "They are the officers you need to respect to"? I don't remember where but I read that is non-standard to place a preposition at the end.
They're the officers you need to respect.
They're the officers you need to respect to.
The former sentence is grammatical, whereas the latter isn't correct.
The verb respect isn't followed by a preposition before its object, so the use of the preposition "to" is not correct in the sentence. Look at the following sentences.
This is the person I talked to yesterday.
This is the person I saw yesterday
The verb talk takes the preposition to. You talk to someone, you don't talk anyone.
The verb see doesn't take a preposition. So you see somebody, you don't see to anybody.