1- Jamal didn't come into work last week. He <em><u>must have been</u></em> ill.
2- Joel did the opposite of what we discussed. He <em><u>couldn't have understood</u></em> our conversation.
3- Tim <em><u>must have passed</u></em> his driving test. He's bought a new car.
4- I found Angela´s ID card under my desk. She <em><u>must have dropped</u></em> it
5- Isabel looks absolutely terrible. She <em><u>mustn't</u></em><em><u> </u></em><em><u>have</u></em><em><u> gone outside</u></em> last night.
6- The plane <em><u>can't have arrived</u></em> on time. There was a strike at the airport.
7- Where 's Clare? Her bag's here and her computer's still on so she <em><u>must have gone</u></em> home.
8- Sorry, I don't know if she's here or not. She was feeling ill so she <em><u>has gone</u></em> home.
9- She <em><u>had been cleaning</u></em> the whole house on her own in two hours. She must have had some help.
10- Oh, great! His car's here. He <em><u>must have come</u></em> home earlier than planned.
Hope it helps you...
Answered by Benjemin ☺️
✅
verb would be the answer i believe
Didn’t u answer ur own question ? It says B
Answer:
informal is the first sentence and formal is the second sentence.
I believe the answer is b. past
