would是will的過(guò)去式，would you～？作為情態(tài)動(dòng)詞，表示“可以請(qǐng)你～嗎？” should是shall的過(guò)去式，作為情態(tài)動(dòng)詞時(shí)，則表示“應(yīng)該～”。

1 would的用法（請(qǐng)記住以下幾個(gè)句型）

would you have a cup of tea？

可以請(qǐng)你喝杯茶嗎？

1.would you～？和will you～？

這兩個(gè)句型皆表示客氣的請(qǐng)求、勸說(shuō)……，但would you～？更客氣些。

would you tell me the way to the station？

勞駕，您能告訴我去車站怎樣走嗎？

（回答同《will you～？》句型）

2.主語(yǔ)+would like to～

表示“想要……”的意思上，與…want to～意思一 樣，但用此句型較客氣。

i want to ask you a question.

=i'd（i would）like to ask you a question.

我想問(wèn)你一個(gè)問(wèn)題。

3.would you like～？

表示請(qǐng)求、勸說(shuō)，是很客氣的說(shuō)法。

would you like a cup of tea？

您愿意喝杯茶嗎？

would you like to sing a song？

請(qǐng)唱首歌好嗎？

注意

i'd讀為〔aid〕

=i would

=i should

=i had

2 should的用法

you should read this book.

你應(yīng)該讀這本書。

1.should（應(yīng)當(dāng)、應(yīng)該）用于所有人稱，與ought to～同義。

you should wait a little more.

=you ought to wait a little more.

你應(yīng)該再多等一會(huì)兒。

2.在表示要求、命令時(shí)，語(yǔ)氣是由should（應(yīng)該）、

～had better（最好）、～must（必須）逐漸加強(qiáng)。

had better

had better相當(dāng)于一個(gè)助動(dòng)詞，它后面要跟動(dòng)詞原形；had better只有一種形式，沒(méi)有has，have better這一形式；它的否定式是在它后面加not。

you had better go now.你最好現(xiàn)在走。

he'd（=he had）better do it now.他最好現(xiàn)在做。

she'd better not cry.她最好別哭。