一个陈述句中be动词能有几个?
不当谓语
动词"be"的用法
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英语的“be”是个特别动词；有些语言，如中文和马来文，并没有“be”这样的动词。
“Be”除了原形的“be”之外，还有另外七种形式：am, is, are, been, being, was, were.
在句子中，“be”可以是主动词(The Principal Verb)或助动词(The Auxiliary Verb).
当主动词时，“be”在性质上属于接系动词(The Linking Verb), 后面要有名词、形容词、地方副词或短语作补足语(The Complement)。例如：
1. The man is a science teacher.
2. Mary's new dresses are colourful.
3. I have been there before.
4. Mother is in the kitchen now.
这四个都是陈述句，可以变成疑问句，方法简单，把主语和“be”或助动词对换位置即可：
5. Is the man a science teacher?
6. Are Mary's new dresses colourful?
7. Have I been there before?
8. Is mother in the kitchen now?
当“be”要在祈使句中出现时，它必须借重助动词“do”或“don't”之助，如：
9. Don't be silly!
10. Do be obedient!
11. Don't be a fool!
“Be”有两种缩写法，如下：
12. He's not...../He isn't....
13. You're not...../You aren't...
但“am + not”的缩写法只有一个：
14. I'm not.
有人用“ain't”, 但这并不是标准英语。
谈过了“be”作主动词的功能，现在看看“be”作助动词时，有些什么用法：
1.“Be + 现在分词”以组成进行式时态(Continuous Tenses)，如：
15. Tony's maid is washing his new car.
16. The children are playing in the field.
17. Samuel was eating when I came in.
18. We have been living here since 1959.
2.“Be + 过去分词”以组成被动语态(The Passive Voice),如：
19. Her money in the drawer was stolen.
20. A number of good jobs are taken up byforeigners.
21. David studied in Taiwan but has been trained as a language lecturer in America.
22. Can all the wonderful birds be found in our Bird Park?
23. The disobedient boy was told to stand out- side the classroom.
24. Steps are being taken to reduce traffic con- gestion during peak hours.
25. Dishonest students will be immediately dealt with.
从上面例子看，“be”这动词外貌平凡，但内涵丰厚。如果没有“be”，补足语的桥梁断了。如果没有“be”,何来进行式时态和被动语态？缺了这几样重要的句式，英语还像英语吗？
、含有be动词的陈述句变一般疑问句和否定句
1 The student is at school.
Is the student at school?
the student is not at school.
2 The students are at school.
are The students at school?
The students are not at school.
3 His father is an English teacher.
is His father an English teacher?
His father is not an English teacher.
4 These cats are crying.
are These cats crying?
These cats are not crying.
5 He is crying under the tree.
is He crying under the tree?
He is not crying under the tree.
6 His birthday is on the twentieth of November.
is His birthday on the twentieth of November?
His birthday is not on the twentieth of November.
7 Mrs. Li and Kitty are in a big shop.
are Mrs. Li and Kitty in a big shop?
Mrs. Li and Kitty are not in a big shop.
8 Everybody is in the classroom.
is Everybody in the classroom?
Everybody is not in the classroom.
9 The boy under the tree is hungry.
is The boy under the tree hungry?
The boy under the tree is not hungry.
10 Your brother’s aunt is on the chair.
is Your brother’s aunt on the chair?
Your brother’s aunt is not on the chair.
11 There’s an eraser on the desk.
is there an eraser on the desk?
There’s not an eraser on the desk.
12 Those are your keys.
are Those your keys?
Those are not your keys.
13 John is his first name.
is John his first name?
John is not his first name.
以下一样。把疑问词is am are 提前变为疑问句。is am are后加not 变否定句
其实也可以这么写I'm crying 。Because i'm sad 。只是习惯上那么写
顺便说一下，楼上说的不对，从句和主句之间连接应该用that之类的词，不是连词，想想but，and 之类的词都是连词，用来连接两个句子。
句子分为简单句，只能有一个动词，复合句，可以有两个动词。
拜托你搞清楚从句的定义好不好
从句是复合句中不能独立成句，但具有主语部分和谓语部分，由that、who、whom，when，why，where。how，which等引导词引导的非主句部分。
而because i'm sad 。是一个完整的主系表结构的句子，可以独立成句，因此这不是从句
有两个
这是一个从句
从句有好多种的好吧 什么条件状语从句，时间状语从句
比如if、when、after、before、until……都可以引导从句
that一般领导宾语从句
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