Can
The modal verb can has the following forms: can – the present tense (e.g. He can speak English) and could – the past tense. The form could is used in two ways: a) in past-time contexts as a form of the Indicative Mood (e.g. He could speak English when he was a child), b) in present-time contexts to express unreality, or as a milder and more polite form of can, or as a form implying more uncertainty than can (e.g. He could speak English if necessary. Could I help you? Could it be true?). Compare with the Russian мог бы: Он мог бы сделать это, если бы у него было время (unreality). Не мог бы я Вам помочь? (politeness). Неужели он мог бы так сказать? (uncertainty).
Can has the following meanings:
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