首先一般是跟doing，表现在进行时
例如：I am jogging.
还可以跟动词过去分词表被动例:The clothes were washed by my mother.
还可以接动词不定式，表示将来例：She is to be married with Bob.
My dream is to be a doctor.I think it is quite great to be adoctor.
在句子中，be有两种主要作用：
一是作为系动词(The Linking Verb)，本身可以作用谓语动词
二是做为助动词(The Auxiliary Verb)，与谓语动词一起构成各种时态和被动语态等。[肯定句] All the wonderful birds can be found in our Bird Park. (助动词有两个：can be )[疑问句] Can all the wonderful birds be found in our Bird Park? (移第一个can)[否定句] All the wonderful birds can not be found in our Bird Park. (在第一个can 后加not)[肯定句] I have been there before. (两个助动词：have， been )[疑问句] Have you been there before?[否定句] I have not been there before.[肯定句] I shall be having my supper at six tomorrow evening. (两个助动词：shall， be )[疑问句] Will you be having my supper at six tomorrow evening?[否定句] I shall not be having my supper at six tomorrow evening. 四.助动词be，无词义，辅助主要动词一起在句中作谓语动词。用法如下：1. be+doing：构成进行时态，有现在和过去两种进行时态。
如：The girls is reading and copying the new words g Tom was always asking questions and trying out new ideas.2. be+going to do，表示"打算或将要做某事"，be有现在和过去两种形式。如：We are going to plant trees in the park.I didn’t know if she was going to come here.3. be+to do，表示"按计划安排将要做某事"。
如：The new shop is not to be opened till next Monday. One night an angel came toMary and told her that she was to have this special boy.五e bethere be句式为：there be+主语部分＋状语部分，表示"某处存在某物"，be常用现在时，过去时和将来时等。
如：Oh， cool! And there are many things to see. There is even a deer park in e are about 80 pyramids in there be a football match in your school next week?六，实义be可以将be视为实义动词，因为它具有实际的词义，如"成为做发生举行逗留到达"等。
如：His daughter wants to be a doctor for animals in her twenties.
Kates birthday partywill be at half past six this evening.
Jim has been in China formorethan two years， but he has not yet been to Yichang
