1. The engineers … the engine from 5 till 7 tomorrow.
a) will test
b) will have tested
c) will be testing

2. We … things for two hours by 8 o’clock yesterday.
a) packed
b) had been packing
c) were packing

3. His father … as an engineer since he was born.
a) is working
b) works
c) has been working

4. You … it last week. I’m really disappointed with you.
a) may have done
b) can have done
c) should have done

5. At that moment I … him.
a) could have kill
b) can kill
c) could have killed

Correct answers:

• 1. c) will be testing — action in progress at a certain time in the future: from 5 till 7 tomorrow.
• 2. b) had been packing — action continued for two hours before a past moment: by 8 o’clock yesterday.
• 3. c) has been working — action started in the past and is still continuing: since he was born.
• 4. c) should have done — reproach about something that was necessary but was not done.
• 5. c) could have killed — unreal possibility in the past. The form after could have is the past participle.

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