Need I explain, _____ how your new phone works?, have to study, We _____ for the final exam., As you can see, _____, the climate is getting warmer., could have come, You _____ to the party., wouldn't have come, I _____ to the party if I'd known Dominic would be here., should have seen, We _____ many more birds on our hike., could have been done, More _____ to clean up the river., must have been, The book _____ really interesting. She was up until at least midnight reading.

Perspectives 3. Unit 6. Workbook. p. 68, Exercise 4

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