The words that you know(are called) your vocabulary.There are a lot of books(written)in easy Engl

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• English译ChineseTo read short stories words you need to know only about two thousand words. Before you leave school, you will learn only one thousand more. The words you know are called vocabulary. You should try to make your vocabulary bigger. Read as many books as you can.There are a lot of books written in English for you to read. You'll enjoy them. When you meet a new word, look it up in your dictionary. Your dictionary is your most useful book.
• The words that you know(are called) your vocabulary.There are a lot of books(written)in easy Engl
• 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?
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