Sometimes it's not_to know the parts of a new word to understand it,but it will help you many timesSometimes it is not__ to know the parts of a new word to understand it,but it will help you many times.为什么要填enough?helpful和useful不可以

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Sometimes it's not_to know the parts of a new word to understand it,but it will help you many timesSometimes it is not__ to know the parts of a new word to understand it,but it will help you many times.为什么要填enough?helpful和useful不可以
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Sometimes it's not_to know the parts of a new word to understand it,but it will help you many timesSometimes it is not__ to know the parts of a new word to understand it,but it will help you many times.为什么要填enough?helpful和useful不可以
Sometimes it's not_to know the parts of a new word to understand it,but it will help you many times
Sometimes it is not__ to know the parts of a new word to understand it,but it will help you many times.
为什么要填enough?helpful和useful不可以吗?

Sometimes it's not_to know the parts of a new word to understand it,but it will help you many timesSometimes it is not__ to know the parts of a new word to understand it,but it will help you many times.为什么要填enough?helpful和useful不可以
不能用helpful
be helpful to + sth.如果是动词的话,应该用动词的现代分词形式及do+ing.
句意:
有时候知道一个新单词的一部分字母对理解它的意思是不够的,但大多数情况都能帮助你(理解单词的意思).

not enough 不够

It's (not) enough to do sth. helpful与useful也有此结构,但用在此处意思不妥.
"有时候,知道一个新单词的组成部分不足以理解这个单词,但是很多时候还是很有帮助的."
这里强调的是"知道单词的部分"这个条件对该单词的理解的程度作用,一般不能说"没有用",只能说是"充分不充分", 比如说,在阅读理解中,知道单词的一些部分,根据句意,上下文猜测的...

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It's (not) enough to do sth. helpful与useful也有此结构,但用在此处意思不妥.
"有时候,知道一个新单词的组成部分不足以理解这个单词,但是很多时候还是很有帮助的."
这里强调的是"知道单词的部分"这个条件对该单词的理解的程度作用,一般不能说"没有用",只能说是"充分不充分", 比如说,在阅读理解中,知道单词的一些部分,根据句意,上下文猜测的准确率就更大,总比全然不知此单词好得多.

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helpful的否定不是not helpful,应该是helpless,useful也同样。
这里enough更贴切一些。并不是没用,是不足够。