Teengers() their health because they play computer games too much.A damaged B are damaging c haveTeengers() their health because they play computer games too much.A damaged B are damaging c have damaged d will damageB和D的区别.

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Teengers()theirhealthbecausetheyplaycomputergamestoomuch.AdamagedBaredamagingchaveTeengers()theirhea

Teengers() their health because they play computer games too much.A damaged B are damaging c haveTeengers() their health because they play computer games too much.A damaged B are damaging c have damaged d will damageB和D的区别.
Teengers() their health because they play computer games too much.A damaged B are damaging c have
Teengers() their health because they play computer games too much.
A damaged B are damaging c have damaged d will damage
B和D的区别.

Teengers() their health because they play computer games too much.A damaged B are damaging c haveTeengers() their health because they play computer games too much.A damaged B are damaging c have damaged d will damageB和D的区别.
b 是在表达一个现在的情况~
d 是在表达一个将来可能发生的情况~

B表示在谈到这件事的时候,这个动作还在进行中
D表示动作即将发生,也就是还未发生