Choose 3 senttences where the underlined words are used correctly:

1)You  must not drive a motorbike without a crash helmet.

2)I will buy the house if it is in good condition.

3)She is quite different her elder sister.

4)I was an hour late because of the heavy traffic.

5)He knew that Mary didn't live him and never would;this thought made him unhappy.

6)When do you usually watch TV set?