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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，may mustn’t，must needn’t，can needn’t，must
read; back to bought; to borrowed; back to kept; to
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
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
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