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can't wouldn't may not won't
fi(X)=min{fi-1(X)，fi-1(X)+pi} fi(X)=max{fi-1(X)，fi-1(X-Wi)+pi} fi(X)=min{fi-1(X-Wi)，fi-1(X-Wi)+pi} fi(X)=max{fi-1(X-Wi)，fi-1(X)+pi
Can’t Wouldn’t May not Won’t
studied had studied was studying have been studying
am making; begin have made; began had made; began was making; begin
Can’t Wouldn’t May not Won’t
make will make have made made'
study; for studying; since studying ; for to study; since
Can’t Wouldn’t May not Won’t
have bought have had buy bought
learn learned will learn have learned
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