英语句子中,什么时候用be,什么时候用具体的 am is are 英语句子中什么时候用a？什么时候用an？
\u5728\u53e5\u5b50\u4e2d\u4ec0\u4e48\u65f6\u5019\u7528be,\u4ec0\u4e48\u65f6\u5019\u7528am,is,are,was,were?am,is,are\u7528\u4e8e\u4e00\u822c\u73b0\u5728\u65f6\uff0cam\u4e0e\u7b2c\u4e00\u4eba\u79f0I\u642d\u914d\uff1bis\u4e0e\u7b2c\u4e09\u4eba\u79f0he\uff0cshe\uff0cit\u642d\u914d\uff1bare\u4e0e\u7b2c\u4e8c\u4eba\u79f0you\u642d\u914d\uff0c\u6216\u4e0e\u7b2c\u4e09\u4eba\u79f0\u590d\u6570they\u642d\u914d\u3002
was,were\u7528\u4e8e\u4e00\u822c\u8fc7\u53bb\u65f6\uff0cwas\u662fis\u7684\u8fc7\u53bb\u5f0f\uff0c\u4e0e\u7b2c\u4e00\u4eba\u79f0I\u548c\u7b2c\u4e00\u4eba\u79f0he\uff0cshe\uff0cit\u642d\u914d\uff1bwere\u662fare\u7684\u8fc7\u53bb\u5f0f\uff0c\u4e0e\u7b2c\u4e8c\u4eba\u79f0you\u642d\u914d\uff0c\u6216\u4e0e\u7b2c\u4e09\u4eba\u79f0\u590d\u6570they\u642d\u914d\u3002
be\u4f5c\u4e3a\u52a8\u8bcd\u539f\u5f62\uff0c\u4e00\u822c\u51fa\u73b0\u5728will\uff0cshould\uff0cwould\uff0cmust\uff0ccan\uff0cmay\uff0ccould\uff0cmight\uff0cought to\u7b49\u60c5\u6001\u52a8\u8bcd\u4e4b\u540e\u3002
a+\u7b2c\u4e00\u4e2a\u5b57\u6bcd\u4e0d\u53d1\u5143\u97f3\u7684\u5355\u8bcd
\u4f8b\u5982\uff1aa student
\u8fd9\u91ccstudent\u91ccs\u53d1\u7684\u4e0d\u662f\u5143\u97f3\u6240\u4ee5\u7528a
an+\u7b2c\u4e00\u4e2a\u5b57\u6bcd\u53d1\u5143\u97f3\u7684\u5355\u8bcd
\u4f8b\u5982\uff1aan egg
\u8fd9\u91cc\u7684egg\u7b2c\u4e00\u4e2a\u5b57\u6bcd\u53d1\u7684\u662f\u5143\u97f3\uff0c\u6240\u4ee5\u7528an
\u7279\u522b\u6ce8\u610f\u4e00\u70b9\u7684\u662f\uff0c\u5f88\u591a\u4eba\u7406\u89e3\u4e3aan+\u9996\u5b57\u6bcd\u4e3a\u5143\u97f3\u7684\u5355\u8bcd\uff0c\u8fd9\u79cd\u7406\u89e3\u662f\u9519\u8bef\u7684\u3002\u4f8b\u5982\uff0ca university.\u8fd9\u91cc\u5fc5\u987b\u7528a\uff0c\u56e0\u4e3auniversity\u7684\u9996\u5b57\u6bcd\u53d1\u7684\u662f\u8f85\u97f3\u3002\u3002\u3002\u8bb0\u4f4f\u4e00\u5b9a\u662f\u53d1\u5143\u97f3\uff0c\u8981\u77e5\u9053\u8fd9\u4e2a\u5355\u8bcd\u56fd\u9645\u97f3\u6807\u5199\u51fa\u6765\u662f\u4ec0\u4e48\u3002\u3002
主语后面直接跟be的话就不用原形的be了，要用am is are
第一人称单数后面跟am
第三人称单数后面跟is
第一二三人称复数后面跟are am是一个谓语动词（一句话里一定要有谓语动词的）为什么要用am？因为am只能和I连用的。is可以和he/she/it等第三人称单数连用。are是is的复数形式，I am doing housework
I am just...(just不是动词，不能充当谓语)
I make(make是动词，可以充当谓语)也可以说I am making...(making是make的现在分词，不能做谓语了)
这些都是一些简单的时态问题
一般现在时的语态用am is are
I am 13 years old 第一人称单数
You are funny 第二人称和其他人称的复数
It is 11 o’clock 第三人称单数
It is going to be rainy里类似会用到be
因为be 是am is are的原型统称，需要使用动词原型的时候就用be了
Be 是am is are的原型，当需要用原型的时候就用be。
比如所，to be adj. Would/will/Can/Could/May/Might/Shall + Be,
其他普通情况用am is are。
比如He is a student. I am a student too. We are students.
be 是is am are 的原型
1. 如果用在情态动词如must, can, should, could ,need 等的后面，用原型be
例如：He must be a student.(他一定是个学生)
2. 在动词不定式to 后面，用be
例如：I want to be a doctor when I grow up.(我长大后想成为一名医生)
3. 在had better, would rather 后面。
例如：You'd better be quiet.(你最好安静点)
I would rather be a doctor than be a teacher.（我宁愿做个医生而不愿做个老师）
其他情况按照主语的人称和数分别用is am are.
单数用am, is 复数用are
第一人称(I)用am,第二人称(YOU)用are,第三人称(He/she)用is
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绛旓細knows how to drive a car, doesn't he?浠栫煡閬撳浣曞紑杞︼紝瀵瑰惂锛熷叾瀹炰笉鍏夋槸闄堣堪鍙ワ紝闂彞涓悓鏍锋湁闇瑕鍖哄埆浠栦滑鐨勭敤娉曪細渚 when do you intend to buy a new car?when are you going to buy a new car?鍚庤呭氨涓嶈兘鐢╠o 鍥犱负Do鍚庨潰+瀹炴剰鍔ㄨ瘝 Be鍔ㄨ瘝,鍗:am/is/are鍚庨潰鏄疄鎰忓姩璇+ing褰㈠紡 ...
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