be动词····什么情况下用be，然后do to 这一类的是怎么用的？有时候一句话是用be的 什么情况下用be动词
\u548cbe\u52a8\u8bcd\u540e\u9762\u7528to do\u5206\u522b\u662f\u4ec0\u4e48\u610f\u601dbe to do sth
\u6309\u7167\u8ba1\u5212\u6216\u5b89\u6392\u505a\u4ec0\u4e48
be\u52a8\u8bcd\u7684\u7528\u6cd5\uff1a
\u4e00\u3001\u4f5c\u5b9e\u4e49\u52a8\u8bcd\u7528
1\u3001\u662f,\u6210\u4e3a \u5982\uff1a
I am a Chinese.
\u6211\u662f\u4e2d\u56fd\u4eba.
He wants to be a doctor.
\u4ed6\u60f3\u6210\u4e3a\u533b\u5e08.
2\u3001\u6709,\u5b58\u5728 \u5982\uff1a
There are seven days in a week.
\u4e00\u661f\u671f\u6709\u4e03\u5929.
To be or not to be----that is the question.
\u751f\u5b58\u8fd8\u662f\u6bc1\u706d-----\u90a3\u5c31\u662f\u95ee\u9898\u6240\u5728.
\u4e8c\u3001\u7cfb\u52a8\u8bcd
1\u3001be +\u73b0\u5728\u5206\u8bcd,\u6784\u6210\u8fdb\u884c\u65f6\u6001,\u4f8b\u5982\uff1a
They are having a meeting.\u4ed6\u4eec\u6b63\u5728\u5f00\u4f1a.
English is becoming more and more important.\u82f1\u8bed\u73b0\u5728\u8d8a\u6765\u8d8a\u91cd\u8981.
2\u3001be + \u8fc7\u53bb\u5206\u8bcd,\u6784\u6210\u88ab\u52a8\u8bed\u6001,\u4f8b\u5982\uff1a
The window was broken by Tom..\u7a97\u6237\u662f\u6c64\u59c6\u6253\u788e\u7684.
English is taught throughout the world.\u4e16\u754c\u5404\u5730\u90fd\u6559\u82f1\u8bed.
3\u3001 be + \u52a8\u8bcd\u4e0d\u5b9a\u5f0f,\u53ef\u8868\u793a\u4e0b\u5217\u5185\u5bb9\uff1a
a.\u8868\u793a\u6700\u8fd1\u3001\u672a\u6765\u7684\u8ba1\u5212\u6216\u5b89\u6392,\u4f8b\u5982\uff1a
He is to go to New York next week..\u4ed6\u4e0b\u5468\u8981\u53bb\u7ebd\u7ea6.
We are to teach the freshpersons.\u6211\u4eec\u8981\u6559\u65b0\u751f.
\u8bf4\u660e\uff1a\u8fd9\u79cd\u7528\u6cd5\u4e5f\u53ef\u4ee5\u8bf4\u6210\u662f\u4e00\u79cd\u5c06\u6765\u65f6\u6001\u8868\u8fbe\u6cd5.
b.\u8868\u793a\u547d\u4ee4,\u4f8b\u5982\uff1a
You are to explain this.\u5bf9\u6b64\u4f60\u8981\u505a\u51fa\u89e3\u91ca.
He is to come to the office this afternoon.\u8981\u4ed6\u4eca\u5929\u4e0b\u5348\u6765\u529e\u516c\u5ba4.
c.\u5f81\u6c42\u610f\u89c1,\u4f8b\u5982\uff1a
How am I to answer him?\u6211\u8be5\u600e\u6837\u7b54\u590d\u4ed6?
Who is to go there?\u8c01\u8be5\u53bb\u90a3\u513f\u5462?
d.\u8868\u793a\u76f8\u7ea6\u3001\u5546\u5b9a,\u4f8b\u5982\uff1a
We are to meet at the school gate at seven tomorrow morning.\u6211\u4eec\u660e\u5929\u65e9\u66687\u70b9\u5728\u6821\u95e8\u53e3\u96c6\u5408.
\u6269\u5c55\u8d44\u6599\uff1a
1\u3001\u5f62\u5f0f
\u6709\u4e0d\u540c\u7684be\u52a8\u8bcd\uff0c\u57fa\u672c\u4e0a\u4e3a\uff1a
am,is,are,was,were,been,being,be\u3002
2\u3001\u88ab\u52a8\u8bed\u6001
\u88ab\u52a8\u8bed\u6001\u7684\u57fa\u672c\u7ed3\u6784\u4e3abe+done\uff08Be\u52a8\u8bcd+\u52a8\u8bcd\u8fc7\u53bb\u5206\u8bcd\uff09
\u4e00\u822c\u73b0\u5728\u65f6\uff1aam/is/are+done
\u4e00\u822c\u8fc7\u53bb\u65f6\uff1awas/were+done
\u4e00\u822c\u5c06\u6765\u65f6\uff1awill+be+done
\u73b0\u5728\u8fdb\u884c\u65f6\uff1aam/is/are+being+done
\u8fc7\u53bb\u8fdb\u884c\u65f6\uff1awas/were+being+done
\u73b0\u5728\u5b8c\u6210\u65f6\uff1ahave/has+been+done
\u8fc7\u53bb\u5b8c\u6210\u65f6\uff1ahad+been+done
用be的时候也就是用它的原形形式，那么需要接动词原形的情况有：
在情态动词之后，如：can be, must be, could be, might be, should be, may be, shall be等
与to构成动词不定式：to be
用在省略主语的祈使句/命令句，如：Be quiet!
至于动词不定式to do，它有两种意味：1. 表示目的，2. 表示将来即将要做的事，所以to be也具有动词不定式的两种含义。只是由于be是一个“系动词”，其后面通常接形容词，也可以接名词、代词。例：To be honest, I don't like it at all.(老实说，我一点也不喜欢它。)
被动的时候用be,比如这个房子被我建起来了。
情态动词要用be，如：can , must , could , might , should may , shall 这些都是情态动词
to后面加原形
简单说动词不定式to do，是要去干嘛...和要...的意思
请采纳~谢
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