should
情態(tài)動(dòng)詞Should表示"勸告"、 "建議 "時(shí)
這時(shí)should常譯作 "應(yīng)當(dāng)"。如：
We Should learn about the computer and make full use of it.我們應(yīng)該了解計(jì)算機(jī)并加以充分利用。
You should listen to the doctor's advice.你應(yīng)當(dāng)聽大夫的話。
You should study the article care fully. 你應(yīng)當(dāng)細(xì)，心學(xué)習(xí)這篇文章。
should還可以表示 "預(yù)測(cè)"、"可能"
They should be here by now.他們現(xiàn)在可能到了。
The reference book should be in the reading-room.這本參考書可能在閱覽室里。
should有時(shí)表示說話人的感情如驚奇、憤怒、失望等
Why should I go? 我干嗎要去?(不滿)
I am sorry that he Should be so obstinate.我很遺憾，他竟這樣固執(zhí)。(失望)
It's strange that it should be so hot today.很怪，今天怎么這么熱。(驚奇)
should后跟動(dòng)詞的完成式時(shí)
這時(shí)句子指的是過去的事情。如果是肯定句，常說明某件事本應(yīng)完成而未完成；如果是否定句，表示發(fā)生了不應(yīng)當(dāng)發(fā)生的事情.如：
You should have stopped at in red light. 你見了紅燈本應(yīng)該停車。
You Should not have gone back to work without the doctor's permission.你不應(yīng)當(dāng)未經(jīng)醫(yī)生許可就回去工作。
He Should have come earlier. 他應(yīng)早一點(diǎn)來。