Read the situations and use the words in brackets to write sentences with must have and can’t have.
When I woke up this morning, the light was on. I *** (forget) to turn it off.
must have forgotten
The phone rang but I didn’t hear it. I must have been asleep (asleep).
Jane walked past me without speaking. She can’t have seen me (see/me).
The jacket you bought is very good quality. It must have been (have/be) very expensive.
I haven’t seen the people next door for ages. They must have gone away (go away).
I can’t find my umbrella. I must have left (leave) it in the restaurant last night.
Don passed the exam without studying for it. The exam can’t have been (can’t) very difficult.
She knew everything about our plans. She must have listened (listen) to our conversation.
Fiona did the opposite of what I asked her to do. She can’t have understood (understand) what I said.
When I woke up this morning, the light was on. I must have forgotten (forget) to turn it off.
The lights were red but the car didn’t stop. The driver can’t have seen (see) the red light.