What are semi-modals in English grammar and how are they different from full modal verbs? How do semi-modals like have to ought to and need to express necessity obligation or advice while behaving similarly to modals but with some differences ...
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What are modal perfects in English and how are they used to express past possibilities obligations or deductions? How do modal perfects combine a modal verb with the perfect tense to talk about events that could have happened or should ...