在英语中，表示决定不做某事通常使用 "decide not to do" 或者 "opt not to do"，例如：

I've decided not to go to the party tonight.
I think I'll opt not to eat dessert tonight.

也可以使用 "choose not to do" 或者 "elect not to do"，例如：

I've chosen not to apply for that job.
We elected not to attend the meeting.

还有一些其他的表达方式，例如 "pass on" 或者 "skip"：

I'm going to pass on the movie tonight.
I think I'll skip the conference this year.