1.don't have to
2.had better
3.not go swimming
wash
without
绝对不会错的。
3.Why not go swimming with us?
因为Why don't you do sth.=Why not do sth.
1 don't need to
2 had better
3 not go swimming
don't need to
had better
not go swim
don't have to
had better
not go swimming
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