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Сводная таблица значений основных модальных глаголов и "have to"

Глагол	Отрицательная форма	Что означает	Примеры
can	cannot (can't)	навыки, умения, физические или умственные наличие возможности	I can speak German. You can run fast. I can help you. He can call a cab.
must	mustn't	must — должен, обязательно нужно, необходимо mustn't — не должен, нельзя	I must hurry or I'll be late. Son, you mustn't behave like this.
should	shouldn't	следует, стоит I think ... should / I don't think ... should	It's an interesting video. You should watch it. I don't think you should care about it.
may/might	may not/might not	можно / нельзя что-то может произойти, но нет полной уверенности	You may not speak loudly in a library. Dan might not come tomorrow. He says he might have some other plans.
have to	not have to	have to — должен, обязан, вынужден, приходится not have to — не обязательно, нет необходимости	We didn't have money for the taxi so we had to walk home. It is the same contract as last year. You don't have to read it again.