Today is Saturday. You must be very happy. Saturdays are wonderful days for doing nothing.今天是周六,你肯定很开心。因为周六是非常美妙的,可以什么都不用做的。
A
我们用Must来表达推断某事是真的,也就是“肯定…”
Jim: My house is very near the motorway.
Bob: It's must be very noisy.
We use must to say that we feel sure something is true:
- You've been traveling all day. You must be tired.( Travelling is tiring and you've been traveling all day, so you must be tired.)
-''Jim is a hard worker' 'Jim? A hard worker? You must be joking. He's very lazy.'
- Carol must get very bored in her job. She does the same thing every day.
We use can't to say that we feel sure something is not possible:
- You've just had lunch. You can't be hungry already.( People are not normally hungry just after eating a meal. You've just eaten, so you can't be hungry.)
- Brian said he would definitely be here before 9.30. It's 10 o'clock now and he's never late. He can't be coming.
- They haven't lived here for very long. They can't know many people.
Study the structure:
B
For the past we use must have (done )and can't have (done). Study this example:
-George is outside his friend’s house. He has rung the doorbell three times but nobody has answered. They must have gone out. (Otherwise they would have answered.)
- The phone rang but I didn't hear it. I must have been asleep.
- I've lost one of my gloves. I must have dropped it somewhere.
- Jane walked past me without speaking. She can't have seen me.
- Tom walked straight into a war. He can't have been looking where he was going.
Study the structure:
Couldn't have... is possible instead of can't have...
- She couldn't have seen me.
- Tom couldn't have been looking where he was going.
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