思馬得英語100個句子學(xué)英語語法（49）：ought的用法

　　<例句>

　　What ought I to say to him?

　　我該對他說些什么呢?

　　<語法分析>

　　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)行形式或被動形式等。ought to 一般不用過去時，在賓語從句中，可用于過去時。ought還可以表示揣測的意味。

　　<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.

　　對此應(yīng)當(dāng)想些辦法。

　　語法分析：后面的不定式可用被動形式。

　　(5) He ought to pass his test.

　　他應(yīng)當(dāng)能通過考試。

　　語法分析：ought還可以表示揣測。

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

　　本不該叫孩子一個人去。

　　語法分析：表示事與愿違，意為“本應(yīng)該，本當(dāng)”。

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

　　他說她該動身去日本。

　　語法分析：在賓語從句中，ought to 可用于過去時。

　　<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