His eyes are red. (go to bed early)
He can't have gone to bed early.
Sue is late for work. (oversleep)
She must have overslept.
Cathy is wet. (take her umbrella)
She must not have taken her umbrella.
Tina and Bob are relaxed. (have a good holiday)
They must have had a good holiday.
Sam is tired. (stay at office late)
He must have stayed at the office late.
His coat is here. (be upstairs)
It must be upstairs.
Their dishes are dirty. (eat dinner here)
They must have eaten dinner here.
Jessica hasn't eaten all day. (be hungry)
She must be hungry.
Helen's hair is short. (grow it)
She can't have grown it
