为什么不是在动词play后加s 而是给他加ing?他擅长于弹钢琴,这是陈述一件事实,也不是进行时吧?
主语三单,整句话是进行时的话,是不是就在谓语后加ing就可以了,不用再去加s,es什么的?
[be good at doing] 擅长···所有的问题都因为这是个固定短语
他擅长于弹钢琴 He is good at playing the piano
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