can't help doing sth.
(1) can't help sth. “忍不住做某事，不能停止做某事”
(2) can't help doing sth. “忍不住做某事，不能停止做某事”
也可以说can't help but do sth. “忍不住做某事，不能停止做某事”
英语解释为be unable to change their behaviour or feelings, or to prevent themselves from doing something。
(3) I can't help it “我忍不住，我情难自禁”
例
A: You read my journal? You little creep!
你读了我的日记，你个小变态！
B: I'm sorry! I couldn't help it.
对不起，我没忍住。
I can't help it. I'm like a mother bear. When I hear my cub crying, I have to run to her.
我情难自禁，我就像一头小母熊，熊宝宝一哭，我就得赶去抱抱她。《摩登家庭》
受不了
can't stand doing sth.
(1) can't stand “不能忍受，受不了”
(2) can't stand sth./sb.“不能忍受……，受不了……”
(3) can't stand doing sth. “受不了做某事”
例
You know I can't stand it when you use that word.
你明明知道我不喜欢你提那个字。
I cannot stand hanging out with his lvy League friends.
我真受不了和他常青藤的朋友们一起玩。
迫不及待
can't wait to do sth.
(1) can't wait/can hardly wait “迫不及待，等不及”
(2) can't wait to do sth. “迫不及待做某事”
(3) can't wait for sth. “急切地等待着某物”
(4) can't wait/can hardly wait有两种含义：
一是用于强调对即将发生的事感到兴奋或迫不及待；
二是用于表示某事物实际上可能十分乏味，表示不期待，幽默用法。
例
They can't wait to see you.
他们迫不及待想见你呢。
I can't wait to go home and watch Here Comes Honey Boo Boo.
我迫不及待想回家看《甜心波波来啦》。
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