6. fill the spaces in the following sentences by using one of these forms + the perfect infinitive of the verbs in brackets. must + perfect infinitive is used for affirmative deductions can't/couldn't + infinitive is used for negative deductions. needn't + perfect infinitive is used for a past action which was unnecessary but was performed. 11. i phoned you at nine this morning but got no answer. ~ i'm sorry. i .. (be) in the garden. 12. i left my bicycle here and now it's gone. ~ someone (borrow) it. * 13. when she woke up her watch had vanished. ~ someone (steal) it while she slept. 14. i've opened another bottle. ~ you (do) that. we've only just started this one. 15. the machine said, "you weigh 65 kilos," and i said, "thank you." ~ you (say) anything. 16. i told him to turn left and he immediately turned right! ~ he (understand) you. 17. perhaps he swam across. ~ no, he (do) that; he can't swim. 18. do you remember reading about it in newspapers? ~ no, i (be) abroad at the time. 19. he (walk) from here to london in two hours. it isn't possible. 20. he was very sick last night. ~ the meat we had for supper (be) good.
11. I phoned you at nine this morning but got no answer. ~ I'm sorry. I (must have been) in the garden.
12. I left my bicycle here and now it's gone. ~ Someone (must have borrowed) it.
13. When she woke up her watch had vanished. ~ Someone (must have stolen) it while she slept.
14. I've opened another bottle. ~You ... (needn't have done) that. We've only just started this one.
15. The machine said, "You weigh 65 kilos," and I said, "Thank you." ~ You (needn't have said) anything.
16. I told him to turn left and he immediately turned right! ~ He (mustn't have understood) you.
17. Perhaps he swam across. ~ No, he (couldn't have done) that; he can't swim.
18. Do you remember reading about it in newspapers? ~ No, I (must have been) abroad at the time.
19. He (can't have walked) from here to London in two hours. It isn't possible.
20. He was very sick last night. ~ The meat we had for supper ... (mustn't have been) good.