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Каждый модальных глаголов – can/could/may/might/must – обладает своей степенью предположения и уверенности по сравнению с остальными.

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How is the verb tense modal verb «could» used?

The English verb «could» is used as both an auxiliary verb and a modal verb? Could is almost always used with a main verb tenses.

  • Could is used as the past tense of «can».
  • Could is used to is used to request something in the present tense.
  • Usually when could is used in the present tense, it is used to ask a question.

Examples:

  • Could the girls come with me to the store?
  • I could not go to the moves last night, I had to study.
  • We couldn’t help you clean the house.

Structure of «could»:

  • When using as a modal verb or an auxiliary verb the verb «could» stays in its base form.
  • Could does not change form according to the subject.
  • Could is followed by a main verb. The main verb also stays in its base form. (The main verb that is used with could doesn’t change form according to the subject.)
Subject «could» «Main Verb»
Positive Sentences I could go to the store
Negative Sentences We could not go to the store
Questions** Could they go to the store

* All subjects are: I, we, they, you, plural nouns, singular nouns and uncountable nouns.

**Questions — When could is used to ask a question, could comes before the subject.

— See more at: http://english-the-easy-way.com/English_ESL/Could_English_Verb.htm#sthash.s9hrMinK.dpuf

Добавлено Октябрь 24, 2014, Yurka Категория Тэг

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