Hello, fellas. In everyday usage, the subject and verb of an adjective clause (relative clause) precede a preposition. On the other hand, to make it more formal, the clause is used as the object of the preposition.

(More on relative clauses: https://englishtips4u.com/2011/11/08/engclass-relative-clause/ and https://englishtips4u.com/2011/11/09/engclass-relative-clause-2/)

According to Cambridge Advanced Learner’s Dictionary, a preposition is a word used before its object (a noun, a noun phrase, or a pronoun), connecting it to another word. It usually shows a temporal, spatial or logical relationship of its object to the rest of a sentence. Examples of prepositions are about, at, by, for, from in, on, through, to, with, and without.

(More on prepositions: https://englishtips4u.com/2011/09/17/engclass-prepositions/)

If the preposition is followed by the adjective clause, pronouns to use are only whom or which. It is never followed by that or who.

Examples:

• He is the man whom we talk about.

         He is the man about whom we talk.

• The lecturer whom you should listen to is explaining course materials.

         The lecturer to whom you should listen is explaining course materials.

• The view which we look at is breath-taking.

         The view at which we look is breath-taking.

• Surabaya is the city which I live in.

         Surabaya is the city in which I live.

(in which has the same meaning as where)

Source:

Cambridge Advanced Learner’s Dictionary

Betty Schrampfer Azar, Understanding and Using English Grammar: Third Edition

Betty Schrampfer Azar, Fundamentals of English Grammar: Third Edition

GrammarBook.com, https://www.grammarbook.com/grammar/probPrep.asp

Compiled and written by @fathrahman for @englishtipsforyou on Sunday, August 12, 2018