Look,the teacher as well as all his students is playing games on the playground这里为什么用is不用ar

而为什么This is my twin sister Lucy.Both she and I are good at drawing.这里要用are?

as well as 连接两个并列主语,谓语同前面的主语保持一致。
还有比如 with,like,but,except,besides,includ-ing,together with,along with,as well as,more than,no less than,rather than 等,其谓语通常要与前面一个主语保持一致。
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第1个回答  2011-02-21
1.carefully,副词
2.more important,更重要
3.earlier,更早
4.higher,colder
5.more,warmer
6.the most interesting,最高级

祝楼主更上一层楼

参考资料:百度一下

第2个回答  2011-02-21
as well as是代表伴随的,谓语形式根据它执勤啊的名词确定
而and是表示并列的,所以必须用复数are
第3个回答  2011-02-21
第一句说的主语是老师,单数,所以用IS
老师像他的学生一样在操场上玩。
第二句BOTH说的是Lucy和我两个人,所以用are
她和我都擅长绘画。
第4个回答  2011-02-22
as well as 后接的是伴随状语,谓语动词应该看主语部分,那就是the teacher,所以用单数

而下一句中both...and...则要用英语中的“就近原则”,谓语动词看离它近的那个主语,这里是I,所以用are