It’s eight o’clock and Donald is in bed already: He can’t / must have been very tired.
must
Say a sentence using can't in the past.
e.g. They can't have employed someone with good English skills.
Oliver was in the classroom five minutes ago: he _______________ home already. (arrive)
can't have arrived
Someone’s left their mobile here: it could / can’t have been Sara o Luis.
could
Roger ate seven slices of pizza. He _______________ very hungry. (be)
must have been
This is not Paseo Zorrilla: we might / must have taken the wrong road.
must
Marvin missed the bus this morning: he can’t / must have arrived on time at work
can't
Say a sentence using a past modal of deduction.
e.g. They must have been really frustrated.
Say a sentence using a past modal of deduction
e.g. They must have put too much weight in the cart.
Say a sentence using a past modal of deduction
e.g. They must have been on a long trip.
The thief ______________________ in through the window. It's not broken or forced. (get)
can't have got
Say a sentence using can't in the past.
e.g They can't have hurt themselves becayse they are smiling.
Say a sentence using might or must.
The ball might have come from a sports shop.
Pablo is very clever: he must / might have passed all his exams with top marks.
must
The driver didn’t stop. He _______________ the red light.(see)
may not/mightnot/can't have seen
I don’t know why Margarita didn’t come to the party: she ____________ busy (be)
might/may/could have been