21.
+ing: talking, mending, cooking, sleeping
ie-y+ing: studying, trying , dying
(e)+ing: diving, writing, taking
double consonat: swimming, shopping, stopping, sitting
22.
1 am trying
2 is snowing
3 why are you looking. ....?
4 are making
5 am looking
6 Where are you going. ...?
7 are shouting
8 are you wearing
9 am not working
10 am not eating
23.
2 are eating
3 am not cleaning , am playing
4 is riding
5 am not going, am staying
6 is watering
7 are washing
8 are having
24.
1 is
2 comes
3 lives
4 is
5 is
6 love
7 learn
8 ride
9 spend
10 is
11 enjoys