11) It (rain) is raining very hard now. It often (rain) rains cats ang dogs at this time of the year

12) Does your son (go) go to school on Saturday? ----- Yes,he does.

13) Are you (listen) listening to music at this time? ----- No, I am not.

14) Listen! The dog (bark) is barking.

15) Hush! The teacher (teach) is teaching.

16) Do they always (travel) travel by air? ----- No, they don't

17) Look over there! Is John (ride) riding his bicycle with no hands?

18) Does John never (come) come early?

19) They usually (not go) don't go to school on Saturday but today they (have) are having a meeting at shool.

20) My father (shave) shaves himself every day. He (shave) is shaving himself at present.

21) I usually (not have) don't have coffee for the morning but I (take) am taking some coffee with my friends at a bar now.

22) Be quiet! Can't you see I (speak) am speaking  on the telephone?

23) He (not work) doesn't work on sundays.