高中动词不定式的时态和语态问题不定式主动语态被动语态与谓语动词的关系一般式To doTo be done动词不定式动作发生在谓语动作之前或之后进行式To be doing无动词不定式动作与谓语动作同时发生完成式To have doneTo have been done动词不定式动作发生在谓语动作之前为什么没有动词不定式的进行被动式：to be being done?The dog was seen to be being killed at that time.这句话的表达有问题吗?
问题描述：
高中动词不定式的时态和语态问题
不定式
主动语态
被动语态
与谓语动词的关系
一般式
To do
To be done
动词不定式动作
发生在谓语动作之前或之后
进行式
To be doing
无
动词不定式动作
与谓语动作同时发生
完成式
To have done
To have been done
动词不定式动作
发生在谓语动作之前
为什么没有动词不定式的进行被动式：
to be being done?
The dog was seen to be being killed at that time.这句话的表达有问题吗?
答