Answer — Exercise 4
0.4 - Visitors from space·Focus 4 - Student's Book
Pergunta
Replace the underlined verb structures with alternatives using can’t, could, may, might and must and an infinitive or perfect infinitive. Use each modal verb once only.
Resposta
- may / might / could have visited
- can't have approached
- must be
- may / might / could have been to
- may / might / could continue