口语中一般都说 I can't take it. 我受不了了

或者说 enough is enough 够了够了

或者说 I can't bear it anymore 我实在是受不了了

或者说 I'm enough for it. 意思同上

很多说法拉

至于书面英语如果是单个词的话 intolerable 是不能容忍的意思

还有 can't afford it

都可以