思馬得英語(yǔ)100個(gè)句子學(xué)英語(yǔ)語(yǔ)法（49）：ought的用法

　　<例句>

　　What ought I to say to him?

　　我該對(duì)他說(shuō)些什么呢?

　　<語(yǔ)法分析>

　　ought總是和to一起用，可以表示義務(wù)、約束力，意為“應(yīng)該，應(yīng)當(dāng)”，語(yǔ)氣比should強(qiáng)，比must弱。還可以表示事與愿違，意為“本應(yīng)該，本當(dāng)”。在口語(yǔ)中表示愿望，意為“......才好”。ought后面的不定式可用完成形式、進(jìn)行形式或被動(dòng)形式等。ought to 一般不用過(guò)去時(shí)，在賓語(yǔ)從句中，可用于過(guò)去時(shí)。ought還可以表示揣測(cè)的意味。

　　<觸類旁通>

　　(1) I ought to write to her today.

　　我今天應(yīng)當(dāng)給她寫信。

　　語(yǔ)法分析：表示“應(yīng)該，應(yīng)當(dāng)”

　　(2) She ought to have stopped at the traffice lights.

　　在紅綠燈前她本應(yīng)該停車。

　　語(yǔ)法分析：后面的不定式可用完成形式。

　　(3) I ought to be leaving now.

　　我現(xiàn)在該走了。

　　語(yǔ)法分析：后面的不定式可用進(jìn)行形式。

　　(4) Something ought to be done about it.

　　對(duì)此應(yīng)當(dāng)想些辦法。

　　語(yǔ)法分析：后面的不定式可用被動(dòng)形式。

　　(5) He ought to pass his test.

　　他應(yīng)當(dāng)能通過(guò)考試。

　　語(yǔ)法分析：ought還可以表示揣測(cè)。

　　(6) The chils ought not to hace been allowed to go alone.

　　本不該叫孩子一個(gè)人去。

　　語(yǔ)法分析：表示事與愿違，意為“本應(yīng)該，本當(dāng)”。

　　(7) He said she ought to leave for Japan.

　　他說(shuō)她該動(dòng)身去日本。

　　語(yǔ)法分析：在賓語(yǔ)從句中，ought to 可用于過(guò)去時(shí)。

　　<鞏固練習(xí)>

　　(1) You ought to ______[read] this novel.

　　(2) Ought I　to ______[write] to say thank you.

　　(3) She ought to ______[come] to the meeting, but I didn't see her.

　　(4) You ought not to _____[drive] so fast.

　　(5) She ought to _____[isolate].

　　(6) The water ought to _____[boil] by now.

　　(7) I ought to _____[hear] from her soon.

　　(8) There ought not to _____ must noise in a hospital.

　　(9) She ought to ______[do] it yesterday.

　　<參考答案>

　　(1) read (2) write (3) have come (4) have been driving (5) be isolated (6) have boiled (7) be hearing (8) be (9) have done