had been supposed to和was supposed to主要是時態(tài)方面的區(qū)別,前者為過去完成時,后者為一般過去時.另外,前者有時還可表示“本來應(yīng)該”,相當(dāng)于was supposed to have done.
關(guān)于suppose的用法,本人在金盾出版社出版的《英語常用詞多用途詞典》上查到了以下用法,本來是摘錄下來自己和的,現(xiàn)與你分享：
1.其后習(xí)慣上不接帶疑問詞的賓語從句,遇此情況,將疑問詞移到主句句首：
Where do you suppose he has gone?你估計他去哪里了呢?
Who do you suppose has stolen the money?你認(rèn)為是誰偷了這錢呢?
2.其后通常不直接跟不定式作賓語,遇此情況可改為賓語從句,如：
通常不說：He supposed to have left his umbrella in the bus.
可改為：He supposed that he had left his umbrella in the bus.他以為把雨傘忘在公共汽車上了.
3.后接不定式作賓語補(bǔ)足語時,不定式通常為to be.如：
I supposed him to be about forty.=I supposed that he was about forty.我估計他大約40歲.
若是to be之外的其他動詞,則通常為完成式或進(jìn)行式.如：
He was supposed to have left for home.大家以為已動身回家了.
4.有時可用于引導(dǎo)條件狀語從句,相當(dāng)于連詞if,但此時與之相對應(yīng)的主句通常(但不絕對)為疑問句.如：
Suppose he doesn’t agree,what shall we do?假如他不同意,那怎么辦?
這樣用的suppose有時還可用于虛擬語氣.如：
Suppose you were given a chance to study in America,would you accept?假如給你一個到美國學(xué)習(xí)的機(jī)會,你會接受嗎?
5.be supposed to do sth為習(xí)語,表示“應(yīng)該(理應(yīng))做某事”.如：
They are supposed to arrive before dark.他們應(yīng)該在天黑 前到.
Everybody knows,but nobody is supposed to know.本來誰也 不該知道這事,但人人都知道了.
注：其中的不定式有時可能是進(jìn)行式或完成式.如：
He’s supposed to be doing his homework at home now.他現(xiàn)在應(yīng)該在家里做作業(yè).
He is not supposed to have left the hospital so soon.他本不該這么早就出院的.
另外,現(xiàn)在分詞形式的supposing可用作conj.,表示“假如”,如：
Supposing he does not come,shall we go without him?如果他不來,是不是不帶他去?/
Supposing he can’t come,who will do the work?如果他不來,誰來干這工作?
這樣用的supposing與if用法相似,用以引導(dǎo)條件狀語從句,但與之相對應(yīng)的主句通常(但不絕對)為疑問句.有時還可用于虛擬語氣.如：
Supposing there was a war,what would you do?假如發(fā)生戰(zhàn)爭,你怎么辦?
Supposing you fell in love with your boss,what would you do?假定你愛上了你的老板,你會怎么辦?
注：suppose也有類似用法：Suppose [Supposing] we miss the train,what shall we do?假如我們誤了火車,我們將怎么辦?