例题1:He is often at church on Sunday 例题2:The Sawyers often at church on Sunday.为什么第一个例子中有be动词is,第二个例子中the sawyers后面没有be动词?
问题描述:
例题1:He is often at church on Sunday 例题2:The Sawyers often at church on Sunday.
为什么第一个例子中有be动词is,第二个例子中the sawyers后面没有be动词?
答