MGIMO

Shouldn’t (oughtn’t to) + the perfect infinitive. is used to refer to an undesirable action in the past that did happen. e.g. You shouldn’t have told. him he was a loser. It was callous. f) Need. is a modal verb, with no 3rd person form. It is used mainly in questions and negatives. The meaning is similar to . have to. e.g. Need . you ask ... ................
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