Cách sử dụng Must và Can't

Cách sử dụng Must và Can't 
 CÁCH SỬ DỤNG MUST VÀ CAN'T 
A. Nghiên cứu ví dụ sau: 
Chúng ta sử dụng must để nói rằng chúng ta cảm thấy điều gì đó là đúng: 
- You've been travelling all day. You must be tired. 
(Travelling is tiring and you've been travelling 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. 
Chúng ta sử dụng can't để nói rằng chúng ta cảm thấy một điều gì đó là không thể: 
- 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. 
Nghiên cứu cấu trúc: 
B. Với thì quá khứ chúng ta sử dụng must have (done) và can't have (done). 
Nghiên cứu ví dụ sau: 
George đang ở bên ngoài nhà bạn anh ấy. 
Anh ta đã nhấn chuông ba lần nhưng không có ai trả lời. 
They must have gone out. (nếu không thì họ đã trả lời) 
- 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 wall. He can't have been looking where he was 
going. 
Nghiên cứu cấu trúc câu: 
Couldn't have cũng có thể được sử dụng thay cho can't have: 
- She couldn't have seen me. 
- Tom couldn't have been looking where he was going