ought

1. She failed one of the exam papers, but we ought to make allowance for the fact that she was ill.
   她有一门不及格，但我们必须考虑到她当时有病。
2. He ought to have kept his promise.
   他原本应该遵守自己的诺言。
3. Regularity ought to be observed, as regularity is very conducive to health.
   生活应遵守规律，因为规律对健康有益。
4. I don't think you ought to.
   我看你不应该。
5. The information ought to be made more accessible.
   资料应该明白易懂。
6. You ought to scrap the old bike and buy a new one.
   你应该扔掉这辆旧自行车，买一辆新的。
7. He ought to/should be here in time he started early enough.
   他该[应]按时到这里--他出发得够早的。
8. You ought to be more careful, you know.
   你应该小心一点，知道吗？

ought

v.aux.（助动词）
Used to indicate obligation or duty:
应当：用于表示义务或责任：
例句：
You ought to work harder than that.
你应当更努力地工作

Used to indicate advisability or prudence:
应该：用于表示合理可行或谨慎的态度：
例句：
You ought to wear a raincoat.
你应该穿件雨衣

Used to indicate desirability:
应该：用于表示愿望：
例句：
You ought to have been there; it was great fun.
你真应该去哪儿；太好玩了

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

来源：
Middle English oughten [to be obliged to]
中古英语 oughten [受迫做…]
from oughte [owned]
源自 oughte [被拥有的]
from Old English 3hte [past tense of] 3gan [to possess] * see ôik-
源自 古英语 3hte [] 3gan的过去时 [拥有] *参见 ôik-

Ought to is sometimes used without a following verb if the meaning is clear:
如果意思明确，有时ought to 后面不需跟动词：
例句：
Should we begin soonô Yes, we ought to.
我们马上开始吗ô 是的，开始。

In questions and negative sentences,especially those with contractions,to is also sometimes omitted:
在疑问句和否定句中，尤其是带缩写的这些句子中，to 有时也会被省略：
例句：
Oughtn`t we be going soonô
难道我们不马上走吗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.
尽管以前在英语里省略to 是可能的， 但现在这样做就会被认为不标准。例如他不会来 和 她不该说 之类的用法在各种美式英语中很普遍。 但在书面英语中应避免这样使用，而应使用更标准的变体ought not to

ought
ought 2

pron.（代词）
adv.（副词）
Variant of aught
aught的变体

ought
ought 3

n.（名词）
Variant of aught 2
aught的变体2

ought
ought 4

v.Obsolete （动词）【废语】
A past participle of owe
owe的过去分词