To Kill a Mockingbird.

I'm looking for a book which (that) teaches you how to relax.

That's the house where I was born.

2 is Frank the man whose brother plays for Manchester United? it's a tree whose leaves change colour in autumn.

3 I've just had a text from the girl (who / that) I met on the flight to Paris.

This is the phone (which / that) I bought yesterday.

• We use a defining relative clause (= a relative pronoun + verb phrase) to give essential information about a person, place, or thing.

1 We use the relative pronoun who for people, which for things / animals, and where for places.

• We can use that instead of who or which.

2 We use whose to mean 'of who' or 'of which:

3 In some relative clauses, the verb after who, which, or that has a different subject, e.g. She's the girl who I met on the train (the subject of met is 1). In these clauses, who, which, or that can be omitted.

She's the girl I met on the train.

• We can't omit who / which / that / where if it's the same subject in both clauses. NOT Julia's the woman-works in the offee with me.

Non-defining relative clauses 
This painting, which was painted in 1860, is worth millions of pounds.

Last week I visited my aunt Jane, who's nearly 90 years old.

Burford, where my grandfather was born, is a beautiful little town.

My neighbour, whose san goes to my son's school, has just remarried.

• We use a non-defining relative clause to give extra (often non-essential information) in a sentence. If this clause is omitted, the sentence still makes sense.

This painting, which was painted in 1860, is worth millions of pounds.

• Non-defining relative clauses must go between commas (or a comma and a full stop).

•In these clauses, we can't leave out the relative pronoun (who, which, etc.).

• In these clauses, we can't use that instead of who / which.

NOT This painting, that was painted in 1860, is worth millions of pounds.

It's cold today, isn't it?

She isn't here today, is she?

You're Polish, aren't you?

You aren't angry, are you?

They live in London, don't they?

They don't eat meat, do they?

The match finishes at 8.00, doesn't it?

Lucy doesn't drive, does she?

Your sister worked in the USA, didn't she? You didn't like the film, did you?

We've met before, haven't we?

Mike hasn't been to Rome before, has he?

You'll be OK, won't you?

You won't tell anyone, will you?

You'd lend me some money, wouldn't you? Sue wouldn't resign, would she?

• Question tags (is he?, aren't they?, do you?, did we?, etc.) are often used to check something you already think is true.