ملخص الدرس / الثآنية ثانوي/اللغة الإنجليزية/Grammar/mustn’t- don’t have to...
الملخص
من الأستاذ(ة) عقيلة طايبيModals of obligation and necessity
Must:
Forms:
| possitive | Negative | Interrogative |
| I/you/he/she/we/they must go now | I/you/he/she/we/they must not/ musn't go now |
must I/he go now when must I/you... go? |
Meaning:
Must= obligation
we use must when we think it is important or essential to do an action .
In England ,you must drive on the left, but in Algeria, you must drive on the right .
Musn't= negative of obligation prohibition .
we use musn't when we think that it is important or essential not to do an action .
we musn't drive fast here.the road sing says that the speed limitis 50 kms per hours
have to
| positive | Negative | Interrogative |
| Zohra is a nurse.some times she has to work on weekends | Yasmine is a teacher she does not have /doesn't have to/needn't work on weekend. |
Does Yasmine have to work on weekends? yes, she does. |
Meaning:
have to : obligation
in positive sentences, we often use have to express obligation .in this case, have to is little different form must.
In Algeria, you have to be 18 before you're allowed to take your driving licence test .
have to : necessity:
We can use have to to talk about an action that is neccessary.
We have to eat in order to live.Eating is neccessity because there is no other possibility for staying alive .
compare:
you dont have to/needn't do this exercise .it's optional .Absence /lack of obligation .
you mustn't cheat in the exam.it's forbidden. Prohibition/ negative obligation .