A. 1) am going
2) is riding
3) are playing
4) isn't singing
5) aren't running
6) isn't crying
7) Are you swimming at the moment?
8) Is she sitting now?
9) Is he smiling now?
B. 1) She is jumping very high.
2) He is listening to music in his room.
3) They are painting a portrait.
4) I am cleaning a window.
5) Paula and Tim are dancing.
6) The bird is flying.
7) Our friends are not swinging.
8) My daddy is not reading a newspaper.
9) I am not eating a sandwich.
10) Our parents are watching TV.
11) He is not walking his dog.
12) Is he throwing a ball?
13) Is she knitting a sweater?
14) Are you climbing a mountain?
15) Is your grandpa fishing?
16) Is it running very fast?
C. 1) is
2) are
3) am
4) are
5) are
6) is
7) am
8) are
9) is
10) is
11) am
12) are
13) are
14) are
15) is
16) am
2. If Mark were younger, he could join the army.
3. She would have stayed at home if she had known there would be so much traffic.
4. Should he get this job, he will be able to buy his own flat.
5. She will be here at eight unless she loses her way.
6. If I were you, I wouldn't go out this weather.
7. Emily would have called me if she had changed her mind.
8. If you like Tom Cruise, you will love this film.
9. Dave will be home at six o'clock, provided he catches the five o'clock bus.