Can modal fe’li ish-harakatning bajarilish imkoniyati yoki qobiliyatini bildiradi. Can

Must ning inkor shakli mustn’t ta’qiqni bildiradi, shuning uchun shart emas, kerak emas deb tarjima qilinmaydi. U ijozatni bildiruvchi may modal fe’lining antonimi hisoblanadi: May I read this book? – No, you mustn’t. (Yes, you may).
Must bilan so’roq berilganda shart emas deyish uchun need modal fe’li yordamga keladi: Must we retell this rule now? – No, you needn,t. (Yes, you must)
Must dan keyin oddiy shakldagi fe’l ya’ni must + fe’l yoki must + be + fe’l + -ing kelsa ba’zi hollarda faraz, taxminni ifodalashi ham mumkin. May bildiradigan ehtimollikdan farqi must bildirgan ehtimollik aniq taxmin ya’ni, so’zlovchi deyarli aniq, haqiqat deb hisoblagan ehtimollik ekanligidadir:
He must be in the library now. Where is Olim? – he must be sleeping in his room.
Carol knows a lot about films. She must go to the cinema a lot.
You have worked too much. You must be tired.
You will have exams next week. You must be working very hard at the moment.
Must taxminni ifodalaganda inkorda va kelasi zamonda ishlatilmaydi, chunki uning ma’nosini can’t beradi.
Must + Perfect o’tgan zamonga tegishli aniq taxminni ifodalaydi:
The phone rang but I didn’t hear. I must have been asleep.
You must have read about it in yesterday’s papers.----
Must ning ekvivalentlaridan biri HAVE TO = have got to dir. Ular ma’nosiga ko’ra bir xil, ammo so’roq va inkor shakllari yasalishiga ko’ra farq qiladi, have got to o’tgan va kelasi zamonlarda ishlatilmaydi:
I have to be at work now = I have got to be at work now. – Do you have to be at work now? = Have you got to be at work now? – I don’t have to be at work now = I haven’t got to be at work now.
I had to be at work yesterday.
I shall have to be at work tomorrow.
Zaruriyatni bildiruvchi modal fe’llar orasida faqat have to shall, will ni oladi.
Have to = have got to faqat zaruriyatni ifodalaydi, buyruq va maslahatni bildira olmaydi. Umumiy qoida bo’yicha zaruratni bildirganda must = have to ga ammo, ularning qo’llanishida kichik farq bor:
Must kishi o’z hissiyoti, fikriga tayanib zarur deb bilgan ish harakat oldidan ishlatiladi:
I must visit my parents. I haven’t seen them for ages.
Our government must do something about unemployment.