play it by ear 看情况而定
【讲解】
ear指“耳朵”，引申为“听到或看到的实际情况”，play it by ear“看情况而定，没有固定计划”。其反义习语为play it by the book，指“严格按规则办事，循规蹈矩”。
【对话】
A:Stay with me, OK? I don't feel like staying here by myself.
A:留下来陪陪我吧，好吗？我不喜欢自己呆在这儿。
B:Well,OK. If something does turn up, I'll just play it by ear.
B:好吧。如果有事的话，我就只好看情况而定了。
A:There's a new movie on campus. Have you heard of it?
A:我们学校要放映一部新电影，你听说了吗？
B:Yes, it's a comedy. Let's go to cinema then.
B:听说了，是个喜剧，那咱们去看电影吧。
