请问be动词的具体用法,比如就近一致原则,A AND B + be,A or B + be
2个回答

e作助动词用的形式如下:

①am,is,are,was,were

②助动词+be:shall be,will be,can be,etc.

③have/has/had + been(完成时)

④am,is,…being(进行时)

(1)表达进行时态

句型 be + V-ing…(进行时态)

例:What are you reading?

(你正在阅读什么?)

I am reading a magazine.

(我正在阅读杂志.)

例:He will be taking a walk in the park at this time tomorrow morning.

(明天早晨此时他将会正在公园散步.)

例:She has been teaching English in our school for years.

(她已在我们学校教英语许多年了.)

解说 第一例句是表达现在进行时,第二例句是将来进行时,第三例句是现在完成进行时.

(2)表达被动语态

句型 be +p.p.…(被动语态)

例:English is spoken in both Canada and the United States.

(加拿大和美国都讲英语.)

例:Those keys were found in your drawer.

(那些钥匙是在你的抽屉里找到的.)

例:It can be done much faster in this way.

(这件工作用这个方法可以更加快速地做好.)