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can’t shouldn’t mustn’t don’t have to
must needn’t mustn’t need
must have returned could return should have returned might return
can; may may; need can; must must; need
mustn’t can’t needn’t couldn’t
whichever however wherever whenever
mustn’t can’t needn’t shouldn’t
mustn’t,may mustn’t,must needn’t,can needn’t,must
mustn't: keep needn't; borrow needn't; keep mustn't; borrow
mustn’t can’t needn’t couldn’t
needn’t, must mustn’,t can mustn’t, may can’t, need
needn't mustn't may not can't
needn’t, must mustn’t, can mustn’t, may needn’t, need
mustn’t needn’t can’t may not
mustn't: keep needn't; borrow needn't; keep mustn't; borrow
Must; mustn’t Could; can’t Must; needn’t Could; couldn’t
must have returned could return should have returned might return
keep borrow lend give back