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

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theyallfeltsleepybecausetheyfoundthelecturehard----tohavebeenunderstood为什么不对?不是found吗?过去时啊不定式也有时态的亚不

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
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

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
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

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。

All the students felt ___after an hour's meeting A asleep B sleep C sleepy 选什么,为什么 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 sleepy fall sleep还是fall sleeping all sleepy they all looked sadly at the tea cher and felt quite sad 这个中文是什么 28、Jack felt unhappy as they all went outing ____ him.能说明理由吗? Jack felt unhappy as they all went outing without him.without可以换成 except 为什么? 28、Jack felt unhappy as they all went outing ____ him. jack felt unhappy as they all went outing--him a.except b but cwithout dbesides when he was a student he often __ in the boring class as soon as he bent over the desk he__soonAfals asleep Bfell asleep,felt sleepy Cfell sleepy .felt asleep D felt sleepy ,fell asleep Jack felt unhappy as they all went outing ______ himA except B but C without D besides(说明理由) 改错A microphone can make your voice sounds louder.He felt happy because they all chose him be their monitor. They all looked( )at the master and felt quite( ).A.sad;sad B.sadly;sadly Csad;sadly D.sadly;sad 16.Jack felt unhappy as they all went outing ___ himA.except B.but C.without D.besides. 2.They all looked ( ) at the waiter and felt ( ).a.sad,sadb.sadly,sadlyc.sad,sadlyd.sadly,sad She felt sleepy ,so she closed her eyes and them fell fast _________(睡觉). They felt the food __ __because they are all hungry.他们感觉这些食物闻起来很香,因为他们都饿了. He hasn't had enough ,so he's all dayA.sleep;sleeping B.asleep'sleepy Csleepy'sleep Dsleep'sleepy