He doesn't like oranges,but I do.What does he like?He likes bananas.为何前一个回答,可以加do后一个就不可以呢?

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He doesn't like oranges,but I do.What does he like?He likes bananas.为何前一个回答,可以加do后一个就不可以呢?

He doesn't like oranges,but I do.What does he like?He likes bananas.为何前一个回答,可以加do后一个就不可以呢?
He doesn't like oranges,but I do.
What does he like?He likes bananas.
为何前一个回答,可以加do后一个就不可以呢?

He doesn't like oranges,but I do.What does he like?He likes bananas.为何前一个回答,可以加do后一个就不可以呢?
这两句的DO都是助词.第一个do,是为了构成否定,doesn't,表示否定.回答则是表示肯定,表示我喜欢.相当于 But I like oranges..
第二个句子What does he like?He likes bananas.这是个特殊疑问句.用DO是回答不了的.
这个句子翻译成中文是 他喜欢什么?他喜欢香蕉.

第一句话的回答用了do,起强调转折作用,意为:他不喜欢橘子,但我很喜欢。省略句。全句完整的是:He doesn't like oranges, but I do like oranges.
后一句话是特殊疑问句回答,如果用do回答,不是无法体现喜欢香蕉了吗?