1. there's no point/what's the point: say this when you think that it is useless to do something because it will not achieve any useful purpose

备注：''there's no point/what's the point''常用于口语中。

例：

"Why don't you tell Mike?" "There's no point—he never listens." （-你干嘛不说给迈克听？  -没用的，他不会听。）

there's no point (in) doing something

There's no point kidding yourself, Karen—he just isn't interested in you anymore. （凯伦，别自欺欺人了，他不喜欢你了。）

It's frustrating, but there's no point in getting angry. （这确实让人沮丧，但生气也没用。）

What's the point of doing something?

You've already decided, so what's the point of discussing it? （你既然都已决定了，还讨论什么？）

see no point/not see the point

I didn't see the point of waiting around, so I left. （我觉得等也白等，所以就走了。）

2. be a waste of time/be wasting your time: use this when you think that someone should not spend their time doing something because it will definitely not achieve anything

备注：''be a waste of time/be wasting your time''常用于口语中。

例：

be a waste of time doing something/wasting your time doing something

You're wasting your time trying to start that car. The battery's completely flat. （别白费力气了，那辆车发动不了，因为电池没电了。）

I told you it would be a waste of time applying for a visa. （我告诉过你了，申请签证也是白费力气。）

Why waste your time trying to convince him? He won't change his mind. （你怎么还要浪费时间去劝他？他不会改变心意的。）

3. it's not worth it: say this when you think that something someone wants to do is not important enough to spend any time or money on

备注：''it's not worth it''常用于口语中。

例：

Don't get angry. It's not worth it. （别生气了，生气不值得。）

"You should have your car serviced." "It isn't worth it. I hardly ever drive now."（-你该把车拿去保养保养了。  -不用了，我现在基本不开车，保养也是白花钱。）

4. it won't do you any good/it won't get you anywhere: say this when you think that someone will not be able to change a situation or persuade someone by doing something

备注：''it won't do you any good/it won't get you anywhere''常用于口语中。

例：

Worrying about the test won't do you any good. （你担心考试也没用。）

All this speculation isn't doing anyone any good. （这样瞎猜对谁都没好处。）

I don't think this is getting us anywhere. Can we change the subject? （我觉得这应该不会成功，能不能换个主题？）

Flattery won't get you anywhere.—I'm not doing it. （拍马屁也没用，我不干。）

5. it's/there's no use: say this when something you are doing is not working so it is pointless to continue

备注：''it's/there's no use''常用于口语中；英式英语中写作''it's/there's no good''

例：

no use (in) doing something

It's no use talking to me about interest rates and mortgages—I find it all too confusing. （别跟我说什么利率啊贷款啊，我听不懂。）

It's no use lying about it because I saw you do it! （你撒谎也没用，我亲眼看到是你做的！）

There's no use in getting upset about it now. （现在生气也无济于事了。）

be no good doing something

It's no good sitting here feeling sorry for yourself. （自怨自艾也于事无补。）

There's no good punishing him hours later, because he won't remember what he's done wrong. （待会再罚他就没用了，那样他记不住自己错在哪。）