3 things you could have done last week if you had had more time., Something you should have done more attentively this week. , Something you could have done better if you had had more free time., 2 things you should have done before to have a better level of English now., 2 places you could have visited if there hadn't been a lockdown. , 2 things you could have done when you graduated from the university, but you didn't, 2 things you must have done better than others at university .

Past Modal verbs (could have, should have ...)

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