Demonstratives

to talk about people or things near us. (e.g. This is a nice cup of tea.)

to introduce people. (e.g. These are my friends John and Michael.)

to begin a conversation on the phone. (e.g. Hello, this is David. Can I speak to Sally?)

What's that?

Those are very expensive shoes.

This is our house, and that's Rebecca's house over there.

'Shall we go to the cinema?' 'Yes, that’s a good idea.'

'I've got a new job.' 'That's great.'

I'm very tired.' 'Why is that?'

This (We have lived in this house for twenty years.)

These (Have you read all of these books?)

That (Who lives in that house?)

Those (Who are those people?)