it`s not good ____( learn) english by heart without knowing how to use them 答案是learning为什么不能用to learn?

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it`snotgood____(learn)englishbyheartwithoutknowinghowtousethem答案是learning为什么不能用tolearn?it`snotgood__

it`s not good ____( learn) english by heart without knowing how to use them 答案是learning为什么不能用to learn?
it`s not good ____( learn) english by heart without knowing how to use them
答案是learning
为什么不能用to learn?

it`s not good ____( learn) english by heart without knowing how to use them 答案是learning为什么不能用to learn?
It is no good/use doing ,it is a waste of time doing ,这都是固定用法