По
when she (open) the window she(be)happy to set it (snow )lightly
when the teacther(come)into the classroom the pupil's (run) around and(scream) at the top of their voices
he (carry) such a heavy suitcase that he could hardly walk

Soon the summer holidays will come! i won't have  to get up early in the morning and run to school. i will be able to stay in the bed till midday. if the weather will be fine my friends and i will go for a walk every day. it will be fun! then i will spend a month in the country where my grandfather and grandmother live. it will be great. i will drink milk and eat a lot of tasty food which my granny will prepare for me. i have many friends in this village because i go there every holidays. we will play football and tennis every day! there is a small river near the forest and we will swim when the weather will be fine.

1. do; i don't

2. is; he is

3. does; he doesn't

4. are; i am

5. do; i do

6. does; it does

7. is; it is

8. does; it does

9. is; it is

10. is; it is

ничего сложного!