PRESENT AND PAST SPECULATIONS

Adam's good with computers – he..................... your problem. Just ask him.

• could solve

• could have solved

I didn't know you needed help. You _____________________ me.

• could have called

• could call

• should called

'Your phone is ringing.' 'It _____________ Laura, she told me she'd call me back.'

• might have been

• can't be

• must be

She____________ how to cook!

• must not have known

• must not know

• must know

• She must be lost.

• She can't be lost.

• She should be lost.

• She can't have had an accident.

• She must have had an accident.

• She couldn't have an accident.

• He can't have good scores.

• He must have good scores.

• He might have good scores.

• She must have worked a lot.

• She might have slept.

• She should have had dinner.

• He might like walking.

• He must have meet his friends.

• He can't be happy

• He might be on vacations.

• It must be on Sunday.

• He can't be working.