當你想要給出非常強烈的建議，甚至帶點威脅含義的時候，可以使用以下三個句型：
You'd better not do this.
你最好別這么做。
You don't want to do this.
你不會想要這么做的。
I wouldn't do that if I were you.
如果我是你我就不會這么做。

例句：
Hey, I wouldn't do that if I were you. There is a fine you would have to pay.
嘿，如果我是你我就不會這么做。你會被罰款的。
You'd better not do that or I am going to hit you on the head!
你最好別這么做，不然我這一拳就會砸在你的腦袋上。
You don't want to do that or the police will come and arrest you.
你最好別這么做，不然警察會來抓你的。

當你想要適當給出友好建議時，以下四點技巧以及相關句型可以參考：
1.Use a modal verb 使用情態動詞
句型：should do sth/ought to do sth 應該做某事
Hey, you should drink less coffee. It makes you jumpy.
誒，少喝點咖啡啦。喝太多你會緊張坐立不安。
Hey, you ought to go out more if you are lonely.
誒你要是覺得孤單，就多出去走走。

2.Make it into a question to make advice less direct 使用問句的形式讓建議聽起來更委婉
句型：Why not do sth?/Why don't you do sth?/How about doing sth? 何不這么做呢？這么做如何呢？
Why don't you start learning to be patient Cara?
卡拉，何不學著耐心一點呢？
How about doing some more exercises Day?
Day，多做點運動如何呢？

3.Put yourself in the person's position 換位思考
句型：If I were you,... 如果我是你的話，...
Hey if I were you I would ask her out, she looks into you.
如果我是你的話我就會約她出來，她看起來很喜歡你。

4.Make a suggestion 使用 suggest/recommend 等建議句型
句型：I would suggest doing sth./I would recommend you to do sth.
I would suggest doing more exercise.
我會建議多做運動。
I would recommend you to watch yourself around her.
我建議你在她面前謹言慎行一點。