1.      I do my duty

2.       We do our homework

3.       I do know him.

4.       I’m doing my exam in a few weeks.

5.       He does know how to play piano.

6.       I need to do my homework now.

7.       My friend does his best to win in the competition

8.       I did lock the door

9.       He does understand you.

10.   Do you do exercises every day?

11.   My mum likes to do shopping, but Idon't

12.   Do you know her? She is my bigsister

13.   Doing nothing seems to be her hobby.

14.   May I help you to do the accounts?