Hi, Sentence: "Sorry I couldn't come /came back to you . I was busy" The normal idiom is ' get back to you', meaning 'reply, speak to you again'. My question/doubt: Can couldn't be used to denote the past tense ?
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RazerSentence: "Sorry I couldn't come/came back to you I was busy"Regarding come/came: All modals (can, could, will, would, ...) and their negations (can't, couldn't, won't, wouldn't, ...) must be followed by the base form of a verb.