Question

3 Choose the correct words.
1 Adil couldn't finish the long-distance race. He
might / can't have had an injury.
2 My grandma played tennis until she was eighty.
She can't / must have been very fit.
3 I'm not sure who phoned. I missed the call.
I suppose it must / could have been my sister.
4 Togzhan is early today. She must / can't have
overslept
5 Alikhan looks upset. He must / can't have done
badly in the test.
6 Yelena is away on holiday at the moment.
You can't / could have seen her yesterday.​