A、swim fast
B、swimming fast
C、swims fast
是
否
A、I can swim
B、He can't swim
C、He can swim
B、He can't fly
C、I can't fly
A、联系动词
B、实义动词
C、情态动词
D、助动词
A、swim
B、swims
C、swimming
A、swim; does
B、swim; can
C、swimming; can
D、swimming; does
A、Kelly can run fast
B、Kelly can jump high
C、Kelly can swim fast
A、You can't go swimming alone
B、You mustn't swim alone
C、You may not swim alone
B、skate