20180119

Modal 'MUST & HAVE TO'




MUST & HAVE TO

Must and Have To is used to say a must, or a necessity, or that something is important to do.

We use Must to say that according to us, something must be done or necessary to be done (Personal Feeling):
-   Sarah is really a brilliant girl. You must meet her.
-   When you come to London again, you must come and see us.
-   This restaurant has great pizza. You must try it. (According to me, you must try the pizza in this restaurant because it is delicious)


Whereas Have To is used to say that something must be done because of it’s rule, or because of certain situation that make it so:
-   Kevin cannot go to the movie with us this evening. He has to work.
-   In Indonesia children have to wear uniform when they go to school.
-   You can’t turn left here. You have to turn right. (Because the traffic sign forbids to turn left)
In a situation like this, to say  that something must be done, we use Have To


Compare the usage of MUST vs HAVE TO :
-   I must get home early this evening. I want to see football match on TV.
-   I have to get home early this evening. my sister is seriously ill.
If we are not sure which one to use, than we better use Have To


We can use Must for Present or Future but not for Past:
-   I must see my dentist now.
-   I must see my dentist tomorrow.

We can use Have to for all tenses:
-   I have to go to hospital now (Present).
-   I have to go to hospital tomorrow (Future).
-   I had to go to hospital yesterday (Past).
-   I have never had to go to hospital (Present Perfect).
-   I might have to go to hospital (Infinitive after Might).


In order to make interrogative and negative sentences which use Have To, we use auxiliary Do/Does/Did :
-   Sarah doesn’t have to work on Saturdays.
-   Andrew didn’t have to go to hospital.
-   What do I have to do to make you believe?
-   Do I have to return your book next Sunday?


Have Got To = Have To
-   I have got to submit the report tomorrow.
-   I have to submit the report tomorrow.
-   Andrew hadn’t got to go to hospital.
-   Andrew didn’t have to go to hospital.
-   When have you got to go?
-   When do you have to go?



Must Not vs Don’t Have To


Must Not is used to forbid something or to say that the best decision is not to do it:
-  Andrew is still ill. He mustn’t go to work.
-  This is a secret. I don’t want anyone to know. You mustn’t tell anyone.
-  I mustn’t eat too much. I’m supposed to be on diet.

Don’t Have To is used to say that it’s not necessary to do something, but if we want to do it, it’s also ok:
-  Andrew can stay in bed tomorrow morning because he doesn’t have to go to work.
-  You can tell me your problem if you want. But you don’t have to.
-  I’m not working tomorrow, so I don’t have to get up early

Needn’t and Don’t Need To = Don’t Have to

-   Andrew can stay in bed tomorrow morning because he doesn’t have to go to work.
-   Andrew can stay in bed tomorrow morning because he needn’t go to work.
-   Andrew can stay in bed tomorrow morning because he doesn’t need to go to work.

*  Needn’t Have + V3
Notice the example below:
Kevin was going to have a meeting with marketing division. He thought the meeting would start at 9.00 am, so he got up early and rushed to the office. But he was wrong. The meeting began at 11.00 am. So; He needn’t have rushed.

Kevin didn’t know that the meeting started at 11.00 am so he got up early and rushed to the office. So when he arrived, the meeting had not started yet. So; he Needn’t have rushed.


Compare Needn’t vs Needn’t Have:
-   That shirt isn’t dirty. You needn’t wash it. (I tell you that the shirt is not dirty, so you needn’t wash it (the shirt has not been washed yet))

-   Why did you wash that shirt? It wasn’t dirty. You needn’t have washed it.
Actually the shirt you washed was still clean. You needn’t have washed it (but you already washed it)


Compare Didn’t Need To vs Needn’t Have:
-   I didn’t need to say goodbye to her, so I just left.
-   I didn’t need to say goodbye to her. But I wanted this to be a memorable farewell, so I said goodbye nicely.
Actually that was not necessary to do and I realized that (the situation happened in the past)


-   I said goodbye to her because I was afraid it would hurt her if I left without a word. But in fact she had expected me to leave her since long time ago. So, I needn’t have said goodbye.
I did something in the past because at that time I thought that was necessary to do. But now I realize that it was not necessary.






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