Grammar

How can we change a verb in simple present to a negative verb? How can we change a verb in simple past to a negative verb? How do we change a verb to negative if it has two parts? Do we change the words like ‘some’ and ‘always’ when turning a sentence into negative?

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When do we use ‘must’? When do we use ‘can’t’? When do we use ‘must have’ and ‘can’t have’?

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