Since ancient times,people (send) ____________messages in many different ways.为什么要用have sent不用have been sent...since不是用于现在完成时种么...

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Since ancient times,people (send) ____________messages in many different ways.为什么要用have sent不用have been sent...since不是用于现在完成时种么...
Since ancient times,people (send) ____________messages in many different ways.
为什么要用have sent不用have been sent...since不是用于现在完成时种么...

Since ancient times,people (send) ____________messages in many different ways.为什么要用have sent不用have been sent...since不是用于现在完成时种么...
have sent是主动
have been sent是被动
二者都是现在完成时态.
在这句话中people是主动send messages,并不是people被sent到什么地去了.
呵呵,这样的解释应该ok吧.

have sent和have been sent都是现在完成时,前者为主动,后者为被动,people是动作实行者,应用主动。

主语是people,不是messages ,所以不用被动形式。

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