it is ——for them to work out the problem by themselves 为什么填easy enough 不填 easily enough?

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it is ——for them to work out the problem by themselves 为什么填easy enough 不填 easily enough?
it is ——for them to work out the problem by themselves 为什么填easy enough 不填 easily enough?

it is ——for them to work out the problem by themselves 为什么填easy enough 不填 easily enough?
be 是系动词 后面接形容词或者名词
enough副词 修饰形容词时放在形容词后面 enough用法口诀是 形前名后(形容词前面名词后面)
I have enough money to travel around the world.
I am rich enough to travel around the world.

系表结构,be动词加形容词构成。

因为系动词IS后要填形容词,而不能填副词