had to do at secondary school , have always had to do , will have to do this semester, can do / can’t do /could do , will be able to do in the future , have never been able to do, might do in the foreseeable future, weren’t allowed to do when they were kids, should do / shouldn’t do / should not be doing, should have done in the autumn semester, could have done last week (but didn’t), needn’t have done during the exam period, have to do / don’t have to do this week, shouldn’t have done when they were at the secondary school.

modal verbs

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