1、一般過去時(shí)表示過去某時(shí)發(fā)生的動(dòng)作或單純敘述過去的事情,強(qiáng)調(diào)動(dòng)作；現(xiàn)在完成時(shí)為過去發(fā)生的,強(qiáng)調(diào)過去的事情對(duì)現(xiàn)在的影響,強(qiáng)調(diào)的是影響.
2、一般過去時(shí)常與具體的時(shí)間狀語(yǔ)連用,而現(xiàn)在完成時(shí)通常與模糊的時(shí)間狀語(yǔ)連用,或無時(shí)間狀語(yǔ).
一般過去時(shí)的時(shí)間狀語(yǔ):
yesterday, last week,…ago, in1980, in October, just now, 具體的時(shí)間狀語(yǔ)
共同的時(shí)間狀語(yǔ):
this morning, tonight,this April, now, once,before, already, recently,lately
現(xiàn)在完成時(shí)的時(shí)間狀語(yǔ)
for, since, so far, ever, never, just, yet, till / until, up to now, in past years, always,
不確定的時(shí)間狀語(yǔ)
3、現(xiàn)在完成時(shí)可表示持續(xù)到現(xiàn)在的動(dòng)作或狀態(tài),動(dòng)詞一般是延續(xù)性的,如live, teach, learn, work, study, know.
一般過去時(shí)常用的非持續(xù)性動(dòng)詞有come, go, leave, start, die, finish, become, get married等.
呵呵,你問的也比較籠統(tǒng),我就給你全面的回答了一遍.你可以問的細(xì)一點(diǎn),我可以給你具體的分析下,哈哈像when這樣的時(shí)間狀語(yǔ)后直接跟動(dòng)詞時(shí)都要加ing是嗎，像這樣的 時(shí)間狀語(yǔ)有哪些你這個(gè)問題好像就和你一開始問的題目沒有太大關(guān)系了，你現(xiàn)在問的就是when以及其他關(guān)系詞引導(dǎo)的狀語(yǔ)從句問題了。在以when,while,if, once ,though,unless 等六個(gè)連詞引導(dǎo)的狀語(yǔ)從句中，若主語(yǔ)與主句的主語(yǔ)相同時(shí)，可將從句中的主語(yǔ)刪除，并將之后的動(dòng)詞變成現(xiàn)在分詞。若是be動(dòng)詞，一律變成分詞being,而being再予以省略。1. when you do the work, you should be careful.= When doing the work, you should be careful.2. If I am free, I'll do it.= If free, I'll do it.3. when you do the work, you must be careful.= When doing the work, you must be careful.4. Though he is poor, he is happy.= Though poor, he is happy.5. While I was watching Tv, I fell asleep.= While watching TV. I fell asleep.6. When you drive a car, you should be alert.= When driving a car, you should be alert.哇哈 又見面了 請(qǐng)問 什么時(shí)候加to 什么時(shí)候加be動(dòng)詞啊呵呵，這兩天手頭事兒有點(diǎn)多，等等哈