III
1. -, the, -
2. -, -
3. the, the
4. the, the
5. the, the, -, the
6. -, -
7. -, the
II
1. can 2. can 3. could 4. can 5. couldn't 6. cannot
III
1. might 2. may 3. may 4. may 5. may 6. may
IV
1. must 2. must 3. must 4. must 5. must 6. mustn't
V
1. You must listen to the teacher at the lesson. 2. You mustn't late. 3. They may live abroad now. 4. May I go for a walk? 5. I couldn't swim last summer. 6. Can you speak German? 7. I must give the books back to a library today.