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Learn what to say when you're making a guess about a past or present situation.
A HALLMARK for correctness in English grammar is subject-verb agreement, which demands that in a sentence, the subject and verb must always agree in number. If the subject is singular, its verb must ...
Stubbs, M. (1986) A Matter of Prolonged Fieldwork Notes towards a Modal Grammar of English. Applied Linguistics, 7, 1-25.
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