3. :I am a student. / It is red.
4. :There is a book on the desk.
5. :Sit down. / Open the door, please.
7. (Yes/No):Is this your pen? → Yes, it is.
8. (What/Where/Who):What’s your name? / Where is the cat?
10. :I, you, he, she, it, we, they
11. :my, your, his, her, our, their
12. :in, on, under, behind(表位置)
15. :I can swim. / Can you jump?