' ve made up my mind.我已经决定了.
I've made up my mind./I've made my decision.
I have already decided./I'm going to do it./I'll do it.
Nothing will get in the way of my decision.
Whatever may come, I won't change my mind.
swear.我发誓。
I swear./I cross my heart./Definitely!
I thought about it a lot.这是经过深思熟虑的。
I thought about it a lot./considered all the options.
I've given it a lot of thought long and hard about it.
短对话
A:I've made my decision. I will go to the court.我决定了，我会出庭的。
B:I suggest you not.我建议你不要这样。
A:I've given it a lot of thought. I think it's the best way to solve this problem.我想了很多，我想这是解决问题比较好的办法。
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is hard to decide.这很难决定。
It is hard to decide./It's not an easy decision to make.
I am having a hard to decide.
I need more time to think about it.我还需要些时间。
I need more time to think about it./Please give me some time.
Allow me to think about it a bit more.
短对话
A:Which one would you like to choose?你想选哪个?
B:It is hard to decide. I need more time to think about it.这很难决定，我需要时间考虑一下。