用括号内所给动词的适当形式填空。

1. Look! The children _________ (play) football on the playground.

    They _________ (play) football every Sunday afternoon.

2. Please be quiet! We _________ (listen) to the song You and Me.

3. — Mrs. Green likes children very much, doesn't she? 

    — Yes, that's true. She __________ (write) a children's book these days.

4. How many lessons __________ Peter __________ (have) on Monday?

5. It's fine today. The sun __________ (shine).