Modal verbs
Modal verbs in English differ from other verbs in that they are not used independently and do not denote a specific action or state, they reflect its modality, that is, the attitude of the speaker to it.There are modal verbs, using which you can tell about the skills of a person (can/could),prohibit or order someone to do something(must),to give advice(should).
I must finish this article till Wednesday. — Я должен закончить эту статью до среды.
You should follow your doctor’s advice! — Тебе следует слушать советы доктора!
She can’t swim so she isn’t coming with us to the river. — Она не умеет плавать, поэтому она не идет с нами на реку.
What languages can he speak? — На каких языках он может говорить?
A modal verb is always used with a semantic verb that is in the initial form (must do, could see).
I can type very fast. — I can type very fast.
Modal verbs have the same form in all persons and numbers. The only exception is have to, which takes the form has after the pronouns he, she, it.
Modal verbs always stand in the present tense (even in the context of the future tense), but some of them can take the past form: can-could; may-might, must-had to.
In negative and interrogative sentences, modal verbs are not used with auxiliary verbs, with the exception of have to.
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