高中英语句子At that time i had no idea how i could hand it to him without being seen.为什么这句话中idea后面不要that?It is well konw what a person eats causes changes in the body.这句话中为什么know后面不要that?

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高中英语句子At that time i had no idea how i could hand it to him without being seen.为什么这句话中idea后面不要that?It is well konw what a person eats causes changes in the body.这句话中为什么know后面不要that?
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高中英语句子At that time i had no idea how i could hand it to him without being seen.为什么这句话中idea后面不要that?It is well konw what a person eats causes changes in the body.这句话中为什么know后面不要that?
高中英语句子
At that time i had no idea how i could hand it to him without being seen.为什么这句话中idea后面不要that?
It is well konw what a person eats causes changes in the body.这句话中为什么know后面不要that?

高中英语句子At that time i had no idea how i could hand it to him without being seen.为什么这句话中idea后面不要that?It is well konw what a person eats causes changes in the body.这句话中为什么know后面不要that?
第一个句子idea后引导的是个同位语从句,对前面的idea这个抽象名词进行解释说明.疑问副词how在从句中作方式状语,意为“怎么样”.而that引导同位语从句时在句中不作任何成分,而且没有意义,它一般引导的是一个意义完整的句子,一个事实.
第二个句子中what a person eats causes changes in the body是主语从句,it是形式主语.what是疑问代词,在从句中作eat的宾语,意为“所...的”.而that引导主语从句时在句中不作任何成分,没有意义.这里如换成that,从句就缺少成分,意义也不完整.但可以说It's well known that what a person eats causes changes in the body.
总结：这两个句子都是名词性从句.疑问代词和疑问副词在从句中充当成分,有意义.但that引导名词性从句时,在句中不充当成分,没有意义.致学

that 不能紧跟着how,what,that,which,who,whose,when等引导从句的词

how已经可以引导从句了。
that可以加可以不加。

高中英语填空That was my ______ first hug and i was 11 years old at that time.A very B quite C ever Djust At that time I was a 高中英语句子At that time i had no idea how i could hand it to him without being seen.为什么这句话中idea后面不要that?It is well konw what a person eats causes changes in the body.这句话中为什么know后面不要that? I saw that Jenny was running at that time同义句 I ___Jenny ___at that time I heard that she was singsing at that time. At that time i know i can't leave you i saw that she was doing her homework at that time.同义句i saw her homework at that time. 在英语句子中的At that time可以换成that time么?（句尾） I wish time could stop at that moment forever. I ____(write) a letter at that time Could I call you at that time?汉语 at that time 用法 at that time at what time at that time呢 I saw that Jenny was runing at that time I __Jenny __at that time改为同义句 i did my homework carefully(用at that time改写) i___ ____my homework carefully at that time I only regret that I didn't hold you tight at that time. Only at that time,I knew that I already had the same one.