He can't help us do it ,I think(改为含宾语从句的复合句)I don't think he can heip us do it为什么don't think 能用而think that不能用?除了think这样的单词以外还有那些单词在复合句中有否定意思的要提前?

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He can't help us do it ,I think(改为含宾语从句的复合句)I don't think he can heip us do it为什么don't think 能用而think that不能用?除了think这样的单词以外还有那些单词在复合句中有否定意思的要提前?
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He can't help us do it ,I think(改为含宾语从句的复合句)I don't think he can heip us do it为什么don't think 能用而think that不能用?除了think这样的单词以外还有那些单词在复合句中有否定意思的要提前?
He can't help us do it ,I think(改为含宾语从句的复合句)
I don't think he can heip us do it
为什么don't think 能用而think that不能用?
除了think这样的单词以外还有那些单词在复合句中有否定意思的要提前?

He can't help us do it ,I think(改为含宾语从句的复合句)I don't think he can heip us do it为什么don't think 能用而think that不能用?除了think这样的单词以外还有那些单词在复合句中有否定意思的要提前?
这是否定转移 也就是你说的否定提前
一般如果主语是第一人称I 都要这样.
第二人称或第三人称可以不这样.
类似的词还有suppose 等等很多

因为这是一句否定句
像think这类词
如果用到复合句
都是在前面否定的。

不知道楼主是什么意思
这个句子完整是这样的，省略了that
I don't think（that） he can heip us do it
楼主想说为什么不是下面这句吗
I think that he can't heip us do it
这个用表法不适合，因为在宾语从句中存在否定前移的说法
就是让主句含否定词
习惯用法...

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不知道楼主是什么意思
这个句子完整是这样的，省略了that
I don't think（that） he can heip us do it
楼主想说为什么不是下面这句吗
I think that he can't heip us do it
这个用表法不适合，因为在宾语从句中存在否定前移的说法
就是让主句含否定词
习惯用法

收起

不能。
think 后跟从句且主语的第一人称（I /we），否定要在主句否定，即用I don't think或we don't think
问题补充：除了think这样的单词以外还有那些单词在复合句中有否定意思的要提前?
还有believe，suppose，expect 等

句中有think时否定要前置。

li ming can't come to help us this afternoon .he has_____A,something important to doB,important something to doC,to do important somethingD to do something important lucy can do her homework a＿,she doesn't want any help.tom told us he didn't know the o＿question He is busy preparing for the speech,so he can't help _____the experiment whih us. He can do the work.He ________.A.needn't help B.doesn't need to help C.needn't to help D.doesn't need any help Ask him to do what he can _____ us,will you.(help)填什么 Ask him to do what he can ___________( help) us,will you? He can do the work himself.He___.A.needn't help B.doesn't need to help C.needn't to help D.doesn't need any help 改错robots can help us do many workRobots can help us do many work He doesn’t need help b() he can do it himself. Edison i＿ many things in his life,he is a great i＿lucy can do her homework a＿，she doesn't want any help。tom told us he didn't know the o＿question you can't do the work if he doesn't help you 改为同义句 He can't help us do it ,I think(改为含宾语从句的复合句)I don't think he can heip us do it为什么don't think 能用而think that不能用?除了think这样的单词以外还有那些单词在复合句中有否定意思的要提前? can`t help but do ,can`t help doing,can`t choose but do,can`t but do都对吗? can't help but doing,can't help but do ,can'help doing的区别 He didn't help us.I _____,he asked us for help can't help do 还是doing can't help but do求例句 He can't _(help ) you