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Modal verbs express meanings such as necessity and possibility. We can use modal verbs to tell or allow people to do things; or we can use them to say how certain or uncertain we are. |
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When one action interrupts another, we use the Past Continuous and the Past Simple together in one sentence. |
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We use the Past Continuous for an action or situation that was happening, but not completed, at a particular time in the past. |
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