CAN/ CAN'T: exercise 1; exercise 2; exercise 3; exercise 4; exercise 5; exercise 6; exercise 7
COULD/ COULDN'T:exercise 1; exercise 2; exercise 3; exercise 4;
SHOULD/ SHOULDN'T: exercise 1; exercise 2; exercise 3; exercise 4; exercise 5; exercise 6; exercise 7
MUST/ MUSTN'T: exercise 1; exercise 2; exercise 3;
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