Since ancient times, people (send) ____________messages in many different ways.
来源:百度知道 编辑:UC知道 时间:2024/06/10 07:23:43
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。
主语是people,不是messages ,所以不用被动形式。
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。
~~~(在线,马上采纳)怎么理解Since ancient times men have been wanted to know more about the moon.
I haven't seen you since childhood.
i didn't since you ask .怎么理解?
翻译:I have't seen him since the week before last.
---Do you smoke? ---No,I don't. It's two years since I___
We can speak_____animals can't.A when B for C since D while
It is ten years since he smoked or didn't smoke
We didn"t finish the work in time. You____us since you were there.
I don't think it advisable that Tom__th the job since he has no experience.
I didn't download yet since my harddisk is full.