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become an expert at 与become expert at 与

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/05/25 22:38:07
become an expert at 与become expert at 与
在新概念第二册的Lesson 59与Lesson 94中出现了,Rex soon became an expert at opening the gate与children become expert at holding their breath under water even before they can walk.其中expert前面一个有an 一个没有.请问是不是分别做名词和形容词的原因,而且后面都可搭配at?
前面的有个an expert是指一个人,所以要加an
后面的expert的主语是children是复数,所以不需要加an
前面的expert是名词专家,后面跟的at在某个领域,指在某个领域是专家
第二个expert是和expert at连用在一起的,意思为擅长或精通