







In English we use should / shouldn't /ought to / oughtn't to give advice. We use should / ought to to say something is a good thing to do and shouldn't / oughtn't to say something is a bad thing to do.
Example sentences :
Note : To ask for advice we can say: What should I do?
In English, "can" is a modal verb and only has a present, past and conditional form. It can also be used with a future meaning.
Example sentences :
Note : Can is not used to talk about specific possibilities.
Example sentences :
In English, could is used to talk about past ability/ permission/ possibility.
Example sentences :
"Be able to" can be used in the present, past, future, present perfect and as a gerund or infinitive.
Example sentences :
Note : be able to in the present and past is more formal than can or could.
In English we use might or may to say something in the future is possible, but not decided.
Example sentences :
To make questions with might we usually use Do you think...?
Example questions :
In English we can also use might in short answers.
Example short answers :
In English we use have to + infinitive to say something is necessary or obligatory. We normally use have to for a general obligation from an outside source, such as work or the law.
Examples sentences :
In English we use don't have to + infinitive to say something is not necessary or obligatory. It means you can if you want to, but it's not necessary.
Example sentences :
To make questions we use do/does.
Example questions :
Form : ( Must + infinitive without to )
In English we use must + infinitive to talk about rules and obligations. We normally use must when the speaker imposes the obligation, such as a teacher to students, or even to yourself.
Form : ( Mustn't + infinitive without to )
In English we use mustn't + infinitive to say something is prohibited.
Example sentences :
Note : You can often use can't or be + not allowed to instead of mustn't.
Example sentences :
Note : Mustn't and don't have to have completely different meanings.
Mustn't Vs Don't Have To
Note : Have to is a normal verb and exists in all tenses whereas must is a modal verb and its only forms are must and mustn't.
You can also use have to and must for strong recommendations.
Example sentences :
In English we use must when we are sure something is true.
Example sentences :
In English we use may or might when we think something is possibly true.
Examples sentences :
In English we use can't when we are sure something is impossible.
Examples sentences :
Note : In this context, the opposite of must is can't, NOT mustn't!
In the past, can't, could, may, might and must for probability change to can't have, could have, may have, might have and must have + past participle (Verb 3).
In the past, should and ought to change to should have and ought to have + past participle (Verb 3).
Note : the form of "must" for obligation and "can" are exceptions.
Must for obligation changes to had to + infinitive
Can changes to could or was able to
| Modal example sentences | |
|---|---|
| I can't find my bra, can you see it? | 나 브래지어 못 찾겠는데, 어디 안 보여? |
| I already couldn't sleep at all last night! | 안 그래도 난 어젯밤 하나도 못 잤다고요! |
| That's nice, can we add some beer to it for me, also? | 괜찮네, 내가 먹게 쌀에 맥주도 좀 넣어줄 수 있어? |
| Yes there were, but they must have been taken 50 years ago! | 있었지만, 50년도 전에 사진이 찍힌 모양이야! |
| I thought I could look for more houses before my second appointment. | 두 번째 약속 가기 전에 좀 더 집을 알아보려고 했던 거야. |
| It's already scary dear, you don't have to make it scarier! | 자기야 좀, 안 그래도 무서우니까 더 무섭게 만들지 말아봐! |
| I don't want to upset you, but I have to tell you something! | 기분 상하게 하려는 게 아니고, 말해줄 게 있어서! |
| I think the chicken must be ready by now. | 닭이 이제 준비가 됐을 텐데. |
| We can get the other things on the way back. | 나머지 것들은 돌아가는 길에 담으면 되잖아. |
| I thought you might not like strong coffees. | 커피 진한 거 안 좋아할까봐. |
| Umm, can I do it after I smoke? | 음, 한 대 피고 와서 해도 돼? |
| Can you do me a favour in return? | 대신 부탁 하나 들어줄 수 있어? |
| They might have some more in stock. | 재고가 좀 더 있을 수도 있어. |
| Then we might not be able to find it here, either. | 그럼 여기서도 못 찾을지도 모르겠다. |
| Then I can start peeling the potatoes. | 그러고 감자를 깎기 시작하면 되니까. |
| Hey, it's my turn, but I think Pogo should go first. | 있지, 내 차례지만, 포고가 먼저 가야 할 거 같아. |
| I don't think electric stoves can make the pan burn! | 전기스토브로 프라이팬에 불이 붙지는 않는다고 보는데! |
| I can't promise, but we can try, at least. | 장담은 못하지만, 시도야 해볼 수 있지. |
| We can see how Bear and Pogo get on together. | 베어하고 포고가 잘 어울리는지 볼 수 있겠다. |
| Or maybe I can have some drinks with friends from work. | 아니면 직장 동료들하고 술이라도 몇 잔 하고 있거나. |