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动词形式构成有规律，
助动词及五种形式标记。1除了助动词英语动词有五种形式：原形，过去式，过去分词，现在分词，不定式例如 see, saw ,seen seeing ,to see.
单独或者与助动词连用，
表示情态、时态、语态意无穷。情态动词有：may ,must ,can ,should ,needn`t daren`t ought to 助动词be =am ,is ,are ,were ,was ,can ,(could ,may ,might ,will ,would ,shall ,should ,must ,had to )be ,have been 。由过去，现在，将来形成的时态以及被动语态，虚拟语气。
时间总不离过去、现在及将来。
传情达意不能少时态。
表示动作反复或无时间性，
一般现在时可表示成。
常用情态词或do/does来提问2:I (do )know it . I (can) teach English .
一般将来时由will或者shall构成句型。3 I shall teach English next year .
完成时态表示动作在过去，现在及将来前已完成4I had taught English by 10 a,m. I have taught English now .I Shall have taught English by 10a.m tomorrow .
过去将来时从过去看将来情况，
would \should 组句可用得上。5He said in 1960 that he would teach Enghlish the following year
一般过去时表示过去动作及所发生情况。6 I taught English last year .he said he could teach English .
在虚拟过去时条件或者结论主句中，
现在动作表示实现可能性很小，
虚拟过去时中would \could /had to ,should,might 不可少。7 If I could teach English ,I should be happy (but i cannot ).If I knew English ,I would teach it
或者无时间性现在动作要顾及到,
此时句中常 用did (or might ,could ,had to )+...有微妙8If I taught English , I should be a bad teacher (but i am not )
虚拟过去完成时在条件和结论句中各不同，
had 接过去分词用于条件句中，9 If I had taught English ,I should have been a good teacher .(but i did not teach )
条件和结论句中皆可表示过去动作不真，
结论句中常用would /should /could /might +have 接过去分词组成10 If I had had a chance ,I should have taught English 
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