我决定放弃了用英文怎么说

"I have decided to give up" 或者 "I have made a decision to quit" 是表达放弃的常用说法。这种表达方式源自英语中动词“decide”和“give up/quit”的使用。

例句：

I have decided to give up smoking. 我决定戒烟了。
After much consideration, I have made a decision to quit my job. 经过仔细考虑，我决定辞职了。