1. A: [?] I go home, Miss? (permission)
     B: I’m sorry Ben. You not. (ability) You need to wait for your mom.

2. A: My secretary grew up in Surin. She speak Thai and Khmer. (ability)

3. A: It’s 10.00. We [?] leave now or we’ll miss our plane. (necessity)

4. A: I don’t feel well today.
     B: You see the doctor. (advice)

5. A: I swim when I was young. (past ability)
         Now, I can’t.
     B: I see.

6. A: you do the test this morning? (past ability)
     B: No, I could not. It was too difficult.

7. A: I’m not sure of his answer.
     B: You’re right. He [?] say ‘yes’ or ‘no’. Only he knows it. (possibility)

8. A: How you be so good at communicating in English? (ability)
     B: I try to read newspapers, listen to English news and write my diary
         in English every day.

9. A: Everyone is here except Chan. He has never been late before.
     B: He [?] be a little late today. He called, saying he had to
         drop his son at school first. (possibility)

10. A: Do I have to pay by cash for the registration fee?
     B: No, you [?]. You [?] pay by check or
         your credit card. (not necessity, possibility)