Understanding 'There', 'Their', and 'They're'

Which of the following sentences correctly uses 'there'?

• Their is a cat on the roof.

• They're going to the park.

• There dog is very friendly.

• There are many stars in the sky.

What is the function of 'their' in a sentence?

• It is a contraction of 'they are'.

• It is used with the verb 'to be'.

• It indicates a place.

• It shows possession.

Which sentence uses 'their' correctly?

• Their going to the store.

• There car is parked outside.

• They're dog is barking.

• Their house is beautiful.

What does 'they're' stand for?

• They were

• They are

• Their

• There

Identify the correct usage of 'they're' in a sentence.

• They're house is big.

• They're going to the concert.

• Their going to the concert.

• There going to the concert.