Defining and non-defining relative clauseA group of related words containing a subject and a verb.s (clauses that start with pronounA part of speech that refers to or stands instead of a noun. E.g.: Who do you think I am? ("you", "I")s such as that, which, who, whom, whose, where, when etc.) refer to nouns mentioned in the main clauseA clause that could be a sentence in itself. E.g.: I wouldn’t go there if I were you. ("I wouldn't go there") When I arrived he was surfing. ("he was surfing") of the sentence. These clauses always follow the nouns they describe.

The girl who you saw me with is not my wife.
Budapest, which is the capital of Hungary, is on the river Danube.

There is a third type of relative clause, which does not describe a preceding noun but continues the story. It is called a connective relative clause, although it is similar to a non-defining relative clause.

I didn’t tidy up my room, which made my mom angry.

Guiding questions: relative clauses
Relative clauses The difference between defining and non-defining relative clauses