1. 1) Is Mark having lunch?
2) David is working in the library
3) Lisa isn’t using the computer
4) Emma and Kate are sitting in the cafeteria
5) Are you listening to music?
6) I am reading something for my history project
2. 7) are you doing
8) I am cooking
9) Are they watching a DVD
10) Aren’t watching it
11) Is painting
12) Is Nina helping her
3. 13) are you talking to
14) I don’t need
15) We go
16) Do you understand
17) He’s getting
18) He hates
19) Are you laughing
20) They do