Modal verbs of assumption or deduction
Oh no! I put my bag down by the door and it´s gone! Someone must have stolen it!
Sorry I couldn´t get out to meet you last night but I had to babysit for some friends.
Look, there´s no one else on the tennis courts. We needn´t have bothered to book one in advance.
Surely you can´t be retiring this eyar? You look so young!
Someone might have come in quietly, picked it up and slipped out with it. It´s possible, you know.
One day, we might/may/will be able to cure many common illnesses.
Apparently there are still plenty of tickets left for this year´s festival, so we don´t have to worry / needn´t worry about getting hold of some.
You don´t have to make up your mind about the job offer yet if you don´t want to.
You might have left it on the bus on the seat next to you when you got off.
It took a lot of work but in the end the mechanic was able to get the car going.
My work colleagues kindly took me out to dinner to celebrate my promotion, and I didn´t need to pay a penny.
How lovely to see you, Bill! And this must be your wife, Betty?
No, I can´t have done, because I remember looking in it on the way here.
Ihaven´t been able to go ice skating for the past few weeks because I´ve injured my leg.
You needn´t apply / don´t need to apply for a visa to travel round this country, as far as I know.
After many failed attempts, they were able to rescue the trapped miners.
I should have been more careful with it, I know. Thank goodness there wasn´t much in it.
I love being able to stay in bed on Sunday mornings.
It was much too cold to go swimming when I was on holiday, so I needn´t have packed my bikini after all.
I´ve just seen the weather forecast and it might not be warm enough for a barbecue after all.