they all felt sleepy because they found the lecture hard----

they all felt sleepy because they found the lecture hard----
to have been understood为什么不对?不是found吗?过去时啊
不定式也有时态的亚
不过我问的是为什么have不对，答案只是to understand
如果to have understood呢

yuezhengshi 1年前已收到2个回答举报

玉蟾宫主蓝兔幼苗

共回答了12个问题采纳率：58.3% 举报

to是动词不定式后面跟动词原型
关于不定式时态
过去时 to do
完成时 to have done
此句逻辑主语是They
所以understand的语态要与逻辑主语一致,不用被动
补充：因为此处不定式做宾语补足语,与时态无关

1年前

hongdou007 幼苗

共回答了692个问题举报

find sth. to do
do不因find的时态改变而改变,因to+原形do。
they all felt sleepy because they found the lecture hard to understand
一般understand不用于完成时态。

1年前

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