1. The sun (warm) warms the air and (give ) gives  us light .

2 .Bad students (not work ) don't work hard .

3.It often (rain) rains in the summer

4. The teacher always (point) points at the black-board when he (want ) wants to explain something.

5. Is he (not do ) not doing morning exercises now ?

6.Water (boil) boils at 100 degrees centigrade .

7. Are you (be )a good student?

8.They (not go) don't go  to school by motorbike.

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make the right verb tense 
1. The sun warms the air and gives us light .
2.Bad students don't work hard .
3.It often rains  in the summer.
4.The teacher always points at the black-board when he wants to explain something.
5.He (not do ) __ morning exercises now ?(sai đề,câu hỏi thì không thể phủ định trừ tag question)

+he isn't doing morning exercises now

hoặc

+is he doing morning exercise now?
6.Water boils at 100 degrees centigrade .
7.are you a good student.(be đã chia sắn là a)
8.they don't go to school by motorbike.