1. She failed one of the exam papers, but we ought to make allowance for the fact that she was ill.
   她有一門不及格，但我們必須考慮到她當(dāng)時(shí)有病。
2. He ought to have kept his promise.
   他原本應(yīng)該遵守自己的諾言。
3. Regularity ought to be observed, as regularity is very conducive to health.
   生活應(yīng)遵守規(guī)律，因?yàn)橐?guī)律對(duì)健康有益。
4. I don't think you ought to.
   我看你不應(yīng)該。
5. The information ought to be made more accessible.
   資料應(yīng)該明白易懂。
6. You ought to scrap the old bike and buy a new one.
   你應(yīng)該扔掉這輛舊自行車，買一輛新的。
7. He ought to/should be here in time he started early enough.
   他該[應(yīng)]按時(shí)到這里--他出發(fā)得夠早的。
8. You ought to be more careful, you know.
   你應(yīng)該小心一點(diǎn)，知道嗎？

ought

v.aux.（助動(dòng)詞）
Used to indicate obligation or duty:
應(yīng)當(dāng)：用于表示義務(wù)或責(zé)任：
例句：
You ought to work harder than that.
你應(yīng)當(dāng)更努力地工作

Used to indicate advisability or prudence:
應(yīng)該：用于表示合理可行或謹(jǐn)慎的態(tài)度：
例句：
You ought to wear a raincoat.
你應(yīng)該穿件雨衣

Used to indicate desirability:
應(yīng)該：用于表示愿望：
例句：
You ought to have been there; it was great fun.
你真應(yīng)該去哪兒；太好玩了

Used to indicate probability or likelihood:
該：用于表示可能性或相似性：
例句：
She ought to finish by next week.
下星期她該完成了

來(lái)源：
Middle English oughten [to be obliged to]
中古英語(yǔ) oughten [受迫做…]
from oughte [owned]
源自 oughte [被擁有的]
from Old English 3hte [past tense of] 3gan [to possess] * see ôik-
源自 古英語(yǔ) 3hte [] 3gan的過(guò)去時(shí) [擁有] *參見(jiàn) ôik-

Ought to is sometimes used without a following verb if the meaning is clear:
如果意思明確，有時(shí)ought to 后面不需跟動(dòng)詞：
例句：
Should we begin soonô Yes, we ought to.
我們馬上開(kāi)始嗎ô 是的，開(kāi)始。

In questions and negative sentences,especially those with contractions,to is also sometimes omitted:
在疑問(wèn)句和否定句中，尤其是帶縮寫的這些句子中，to 有時(shí)也會(huì)被省略：
例句：
Oughtn`t we be going soonô
難道我們不馬上走嗎ô

Although the omission ofto was formerly possible in English, it is now considered nonstandard. ·Usages such asHe hadn`t ought to come and She shouldn`t ought to say that are common in many varieties of American English. They should be avoided in written English,however, in favor of the more standard variantought not to.
盡管以前在英語(yǔ)里省略to 是可能的， 但現(xiàn)在這樣做就會(huì)被認(rèn)為不標(biāo)準(zhǔn)。例如他不會(huì)來(lái) 和 她不該說(shuō) 之類的用法在各種美式英語(yǔ)中很普遍。 但在書(shū)面英語(yǔ)中應(yīng)避免這樣使用，而應(yīng)使用更標(biāo)準(zhǔn)的變體ought not to

ought
ought 2

pron.（代詞）
adv.（副詞）
Variant of aught
aught的變體

ought
ought 3

n.（名詞）
Variant of aught 2
aught的變體2

ought
ought 4

v.Obsolete （動(dòng)詞）【廢語(yǔ)】
A past participle of owe
owe的過(guò)去分詞