you look much younger than i do.you look much younger than i 后面为什么还要加个do呢?

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you look much younger than i do.you look much younger than i 后面为什么还要加个do呢?
you look much younger than i do.
you look much younger than i 后面为什么还要加个do呢?

you look much younger than i do.you look much younger than i 后面为什么还要加个do呢?
do作为助动词非常活跃,这里代替前面提到的动词look,避免重复.

do 指代的是i look
要是没有do,就是你看上去跟我在比了

因该是你看上去跟我看上去比