The words that you know(are called) your vocabulary.There are a lot of books(written)in easy EnglEnglish.两个都是被动语态.为什么一个加be动词一个不加?

问题描述:

The words that you know(are called) your vocabulary.There are a lot of books(written)in easy Engl
English.
两个都是被动语态.为什么一个加be动词一个不加?