Question

Fill in the correct infinitive tense:

1. I think he left. He must .......

2. I think they will come. They must..........

3. I think she is studying. She must.............

4. I think it will be delivered. It must .......

5. I think he was fired. He must .......

6.I think they were arguing. They must.....

7.I think he is lying. He must.....

Answer 1

1. I think he left. He must  have left.

2. I think they will come. They must come.

3. I think she is studying. She must be studying.

4. I think it will be delivered. It must be delivered.

5. I think  he was fired. He must have been fired.

6.I think they were arguing. They must have been arguing.

7.I think he is lying. He must be lying.