Modals for guessing
Revision

Make guesses to explain the following situations using the modal auxiliaries 
 ‘must’, ‘may’, ‘might’, ‘could’, and ‘can’t’. 
Put them into the past tense where necessary.

I can’t find my text book. I had it this afternoon at work but it’s not in my bag now.

My boyfriend promised to call me this afternoon but he didn’t!

I’m worried about my grandmother. She never goes out but when I called her this afternoon, no one answered.

I think I’ve been ripped off. I ordered a camera on mail order and sent off a cheque for a thousand dollars. That was six weeks ago and I haven’t heard anything.

I tried to feel my pulse this afternoon but I couldn’t feel a thing. I think my heart has stopped beating!

When I came home from the pub last night, I put the key in my front door but it wouldn’t fit. I tried three times and in the end I had to sleep in the car.

I’ve just got a telephone bill for HK$40,000. I only make local calls!

Oh my god, what am I going to do? As I was coming home last night about midnight, I saw my girl/boyfriend walking down the street with another man/woman!

My son said he saw Bruce Lee walking down the street in Mong Kok yesterday.