be动词在句子中有多少意思 为什么不同句子翻译成不同意思 还有些句子是不翻译的 还有to在句子中也是一样

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助词 v.aux.
1.(与动词的现在分词连用,构成各种进行时态)正在...,在...
I won't be free this afternoon. I'll be seeing a friend off.
我今天下午没空,我要给朋友送行.
What were you doing from 9 to 11 this morning?
今天上午九点到十一点你在做什么?
He is working.
他在工作.
2.(与及物动词的过去分词连用,构成被动语态)被...
The problem was solved long ago.
问题早解决了.
It will be discussed tomorrow.
此事将在明天讨论.
3.【旧】(与不及物动词go,come,rise等的过去分词连用,构成完成时)已经...
The sun is set.
太阳已经下山.
4.(与动词不定式连用,表示职责、义务、意图、约定、可能性等)应该做...,必须做 ...;预定做...;会做...
The President is to visit Japan next week.
总统将于下周访问日本.
You're to do your homework before you watch TV.
你应该做了功课再看电视.
不及物动词 vi.
1.是[L]
At that time he was the chair of the department.
当时他是系主任.
I am a teacher and they are my students.
我是老师,他们是我的学生.
She is very young.
她非常年轻.
2.(表示时间、度、量、价值等)是;值;等于[L]
The watch is 100 dollars.
这表值一百元.
3.(常用祈使语气或不定式)要,得;成为;变成[L]
Be quiet, please.
请安静.
4.(与there连用)有[L]
There are a lot of tourists there.
那里有许多观光客.
5.逗留,(继续)呆[L]
He will be here all next week.
下周他将一直呆在这儿.
6.在[Q]
Tony is in the office.
托尼在办公室里.
7.存在
Whatever is has every reason for being.
存在的东西总有其存在的理由.
8.听任
If she's sleeping, let her be.
如果她在睡觉,就别惊动她.