ought是什么意思？

You use ought to to mean that it is morally right to do a particular thing or that it is morally right for a particular situation to exist, especially when giving or asking for advice or opinions.

You use ought to when saying that you think it is a good idea and important for you or someone else to do a particular thing, especially when giving or asking for advice or opinions.

You use ought to to indicate that you expect something to be true or to happen. You use ought to have to indicate that you expect something to have happened already.

You use ought to to indicate that you think that something should be the case, but might not be.

You use ought to to indicate that you think that something has happened because of what you know about the situation, but you are not certain.

You use ought to have with a past participle to indicate that something was expected to happen or be the case, but it did not happen or was not the case.

You use ought to have with a past participle to indicate that although it was best or correct for someone to do something in the past, they did not actually do it.

You use ought to when politely telling someone that you must do something, for example that you must leave.