動(dòng)詞不定式一般式所表示的時(shí)間關(guān)系
1)動(dòng)詞不定式一般式表示的動(dòng)作與謂語(yǔ)動(dòng)詞表示的動(dòng)作同時(shí)發(fā)生。如：
I saw him go out.我看見(jiàn)他出去了。(saw與go out兩個(gè)動(dòng)作同時(shí)發(fā)生)
Would you help me put things in order before we leave?在我們離開(kāi)之前，你幫我整理一下東西好嗎?(would help和put同時(shí)發(fā)生)
2)但在很多情況下，動(dòng)詞不定式一般式表示的動(dòng)作發(fā)生在謂語(yǔ)動(dòng)詞表示的動(dòng)作之后；如：
I hope to see you again.我希望再見(jiàn)到你。(to see這個(gè)動(dòng)作發(fā)生在hope之后)
The boy said he wanted to be a scientist.這男孩說(shuō)他想做一個(gè)科學(xué)家。(to be在wanted之后)
動(dòng)詞不定式的時(shí)態(tài)形式
動(dòng)詞不定式通常有三種時(shí)態(tài)形式，現(xiàn)以write為例：
一般式to write進(jìn)行式to be writing
完成式 to have written
動(dòng)詞不定式完成式的用法
動(dòng)詞不定式完成式表示的動(dòng)作發(fā)生在限定動(dòng)詞表示的動(dòng)作之前。如：
I am sorry to have kept you waiting.對(duì)不起，叫你久等了。(to have kept發(fā)生在am所表示的時(shí)間之前)
She seems to have read the book before.她好像看過(guò)這本書(shū)。(to have read發(fā)生在seems所表示的時(shí)間之前)
The battery appears to have run down.這組電池好像已經(jīng)用完了。(to have run down發(fā)生在appears所表示的時(shí)間之前)
但在下面句子中，動(dòng)詞不定式表示"動(dòng)作沒(méi)有完成"：
We were to have met at ten.我們本來(lái)是約定十點(diǎn)鐘見(jiàn)面的。(結(jié)果未見(jiàn)面)