It’s a good idea to learn about relative clauses in English:

5 Helpful Facts about Relative Clauses

1. Relative clauses give info about a person or thing in a sentence.

2. A defining relative clause gives vital info. We can’t skip it. No commas!

The house which they bought was very nice.

3. A non-defining relative clause gives extra info. We can skip it. Commas!

The house, which is in New York, was very nice.

4. We use relative pronouns and adverbs to begin a relative clause: which and that for things; who and that for people; whose for possession; when for times; where for places; and why for reasons.

5. We can delete which, that, and who if they are followed by a subject:

The house [which] they bought was very nice.

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