Explain the concept of 'preposition + which' in relative clauses.

In relative clauses, the concept of 'preposition + which' is used to provide additional information about a noun or pronoun in a sentence. It is a way to add more detail or clarify the relationship between the noun and the rest of the sentence.

The structure of 'preposition + which' in relative clauses is as follows: preposition + which + subject + verb. The preposition is followed by the pronoun 'which', which acts as the subject of the relative clause. The subject is then followed by the verb.

For example, consider the sentence: "The book on the table, which I borrowed from the library, is very interesting." In this sentence, the preposition 'on' is followed by the pronoun 'which', which acts as the subject of the relative clause. The subject 'which' is then followed by the verb 'borrowed'. The relative clause "which I borrowed from the library" provides additional information about the book on the table.

The 'preposition + which' construction is commonly used to provide information about the location, time, or manner of an action or event. It helps to specify the details of the noun or pronoun being referred to in the sentence.

Here are a few more examples to illustrate the concept:

1. The house in which I grew up is now for sale.
2. The car with which she won the race was a red Ferrari.
3. The restaurant at which we had dinner last night was excellent.

In these examples, the prepositions 'in', 'with', and 'at' are followed by the pronoun 'which', which acts as the subject of the relative clause. The subjects are then followed by the verbs 'grew up', 'won', and 'had', respectively.

Overall, the concept of 'preposition + which' in relative clauses allows for the inclusion of additional information and helps to provide a clearer understanding of the relationship between the noun or pronoun and the rest of the sentence.