The key answer of exercise 4
The key to exercise solutions in chapter 0.4 - Visitors from space for the textbook Focus 4 - Student's Book with authors Kay Sue, Jones Vaughan, Brayshaw Daniel and Beata Trapnell from Pearson Education
Question
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.
Answer
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