1. Sandy and Sue are going to school.

2. John is reading a book.

3. We are waiting for you outside the bookstore.

4. The boy is playing basketball.

5. The children are singing under the tree.

6. My sister is looking after the baby.

7. She is listening to music.

8. I am doing your homework.

9. Young Pioneers are helping the old woman.

10. She is sitting next to the driver.

这些句子都使用了现在进行时，表示正在进行的动作或状态。