decide和determine都是表示“决定”。在语气方面，determine比decide要更坚定。在用法上区别不大，具体如下：

decide on/to do

determine on/to do

be determined to do

类似表达还有：

make up one's mind to

make a decision

They decided to break up.

他们决定分手了。

We have reached a decision.

我们已经做出了决定。

I made up my mind to study hard and win a scholarship this year.

我决定今年好好学习获得奖学金。

What have you decided?

你做了什么决定？

I've decided to study abroad.

我已经决定去国外学习了。

I will back you up no matter what you decide.

不管你做什么决定，我都支持你。

I can't make a decision without knowing the facts.

在不了解事实的情况下，我不能做出决定。

经典对话

A: The summer vacation is coming up. Do you have any plans?

暑假就快要到了，你有什么计划吗？

B: I haven't decided yet, but my parents want to travel to Mexico this summer and they want me to go with them.

我还没有决定好，不过我父母想在这个夏天去墨西哥旅游，他们想让我跟他们一起去。

A: That's a good thing. You can take advantage of this holiday to relax for getting better results next year.

那是好事啊，你可以利用这个假期好好放松一下，以备明年取得更好的成绩。

take advantage of...表示“利用”，take good advantage of..表示“好好利用”，take full advantage of表示“充分利用”

B: Yes, I think so too. How about you? Have you made any decisions yet?

是的，我也这样想你呢，已经做了什么决定吗？

A: Well, I have decided to travel to Europe this summer holiday.

是的，我已经决定在这个暑假去欧洲游。

B: Alone?

你一个人吗？

A: I would like that very much. But my parents feel worried about me, so I have to go with my classmates.

我很想这样，但是我父母不放心，所以我只能跟同学一起去了。

B: Your parents are right, it's safer.

你父母很对，这样比较安全。

A: Yeah, anyway, I'm glad I can visit Europe this time.

是的，不管怎么样，我还是很高兴这次能去欧洲旅游的。

B: I know this is your dream all along. I'm so happy for you.

我知道这是你一直以来的梦想，真替你高兴。

all along表示“自始至终”，相当于all the time

A: Thank you, and I've planned my routes. I'll travel through all the countries I like, especially Britain, Germany, the Netherlands and France.

谢谢，而且我已经计划好了路线，我会把我喜欢的国家都逛一遍，尤其是英国，德国，荷兰和法国。

B: Good idea. Well, I've decided I'm going to travel to Europe with you. I think it'll be more interesting.

好主意。好了，我已经决定了，我要跟你一起去欧洲旅游，我觉得这样会更有趣。

A: Okay. Welcome to join us. But you will have to talk to your parents first.

好啊，欢迎加入我们，不过你还是先跟你父母商量一下。

B: I know, I'll tell them tonight.

我知道，我今晚就跟他们说。

A: Alright. I wait for your good news.

好的，等你的好消息。