为什么my sister often does her homework very 加（carefully）不是（car

因为 carefully 是副词,而副词才能修饰 does 这个动词
而 careful 是形容词,形容词只能修饰名词,比如 She is a careful person.这里 careful修饰她,她是个人,不是个动词,才可以用形容词
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