Tổng hợp cách dùng "Should"

Tổng hợp cách dùng "Should" 
 PHẦN 1: SHOULD CÓ NGHĨA "NÊN" 
A. You should do something: Đó là một điều tốt hoặc một điều đúng đắn cần phải 
làm. Bạn có thể sử dụng should để đưa ra lời khuyên hoặc đưa ra một ý kiến: 
- You look tired. You should go to bed. 
- The government should do more to help homeless people. 
- ‘Should we invite Susan to the party?’ ‘Yes, I think we should.’ 
Chúng ta thường sử dụng should với I think / I don't think / Do you think?: 
- I think the government should do more to help homeless people. 
- I don't think you should work so hard. 
- ‘Do you think I should apply for this job?’ ‘Yes, I think you should.’ 
‘You shouldn't do something’ = it isn't a good thing to do: 
- You shouldn't believe everything you read in the newspapers. 
Should không mạnh như must: 
- You should apologise. (= it would be a good thing to do) 
- You must apologise. (= you have no alternative) 
B. Chúng ta cũng sử dụng should khi một điều gì đó không đúng hoặc những gì 
chúng ta mong đợi. Ví dụ: 
- I wonder where Liz is. She should be here by now. (= she isn't here yet, and this 
is not normal) 
- The price on this packet is wrong. It should be £1.20, not £1.50. 
- Those boys shouldn't be playing football at this time. They should be at school. 
We use should to say that we expect something to happen: 
- She's been studying hard for the exam, so she should pass. (= I expect her to 
pass) 
- There are plenty of hotels in the town. It shouldn't be difficult to find somewhere 
to stay. (= I don't expect that it will be difficult) 
C. ‘You should have done something’ = you didn't do it but it would have been 
the right thing to do: 
- It was a great party last night. You should have come. Why didn't you? (= you 
didn't come but it would have been good to come) 
- I'm feeling sick. I shouldn't have eaten so much chocolate. (= I ate too much 
chocolate) 
- I wonder why they're so late. They should have been here an hour ago. 
- She shouldn't have been listening to our conversation. It was private. 
So sánh should (do) và should have (done): 
- You look tired. You should go to bed now. 
- You went to bed very late last night. You should have gone to bed earlier. 
 D. Ought to 
Bạn có thể sử dụng ought to thay cho should trong các câu ở bài này. Chú ý rằng 
chúng ta nói ‘ought to do’ (with to): 
- Do you think I ought to apply for this job? (= Do you think I should apply?) 
- Jack ought not to go to bed so late. (= Jack shouldn't go) 
- It was a great party last night. You ought to have come. 
- She's been studying hard for the exam, so she ought to pass.