英语各种从句时态

过去、现在和将来以及完成时态，从句有状语从句、名词性从句和定语从句

有三大类1.名词性从句 2.定语从句 3.状语从句名词性从句中分：1.主语从句：例，it is important to read book.(形主it作主语，真正的主语是to read book)that air has pressure was known long ago.(关联词that引导的句子that air has pressure作主语从句)2.宾语从句：I think it necessary that he should do his homework.(形式宾语it引导的)I'm sure that my test will succeed.(sure后用that引导的宾从)3.表语从句：系动词后的从句it may be as you say(be是系动词，后面用as引导的)this is that he is too young to go to school.(有系动词is，后面由that引导的表语从句)4.同位语从句：同位语从句是对前面名词的解释说明，如：The facts that he had done his homework.(事实就是he had done his homework，是对前面the facts的解释，是什么事实)定语从句：在句子中起定语作用，修饰剧中的名词或代词的从句叫定从例：the man (who is shaking hands with my father) is my teacher.(括号中就是定从，修饰限定the man)BeiJin is a city (which has a long history).(括号中是定从，修饰the city)状语从句：在复合句中担任状语成分的从句叫状语从句例：I will tell her about that (when i see her). 为时间状从just stay (where you are).为地点状语Because he is ill,he is absent today.为原因状语

初中英语需要掌握掌握的全部时态就是一般现在时，现在进行时，一般过去时，一般将来时，现在完成时。过去进行时，过去完成时。这是主动语态的时态被动语态，需要掌握的时态就是一般现在时的被动语态，一般过去时的被动语态和含有情态动词的被动语态。从句需要掌握的是时间状语从句。原因状语从句，条件状语从句，比较状语从句。宾语从句表语从句定语从句

那要看什么从句了。（1）宾语从句如果主句是一般现在是，则从句按实际情况判断，如果是过去是从句变为相应的过去，比如本来是一般现在变为一般过去，一般将来变为过去将来，现在进行变为过去进行，现在完成变为过去完成，等等（2）状语从句，特殊的是条件状语从句，主句将来。从句一般现在。其他的时态保持一致。（3）定语从句，按照具体情况来判断。不受主句限制，例如，thewomen(whomyoutalkedwithyesterday)ishanmei.括号中的是定语从句初中主要涉及到这三种。这也只是我自己的总结，你可以在多看写参考书