from one to five yesterday The boy jumped up and down.这男孩跳了一下The boy was jumping up and down.这男孩不停地跳着jump up是跳 为什么要加一个down

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fromonetofiveyesterdayTheboyjumpedupanddown.这男孩跳了一下Theboywasjumpingupanddown.这男孩不停地跳着jumpup是跳为什么要加一个

from one to five yesterday The boy jumped up and down.这男孩跳了一下The boy was jumping up and down.这男孩不停地跳着jump up是跳 为什么要加一个down
from one to five yesterday
The boy jumped up and down.
这男孩跳了一下
The boy was jumping up and down.
这男孩不停地跳着
jump up是跳 为什么要加一个down

from one to five yesterday The boy jumped up and down.这男孩跳了一下The boy was jumping up and down.这男孩不停地跳着jump up是跳 为什么要加一个down
jump up是跳没错,但是跳了总要下来的吧,这是人家说的习惯,就像我们说的:我来了.你却没见人只说:我来