重点讲解：
1. cry one's eye out
痛哭；
eg. She cried her eyes out at the loss of the necklace.
她丢失项链后哭得很伤心。
eg. You can cry your eyes out all day, but you will get no sympathy from me.
你可以大哭一整天，但是我决不会同情你。
2. laugh one's head off
（表示强调）大笑；
eg. He carried on telling a joke, laughing his head off.
他继续讲笑话，自己笑得前仰后合。
eg. It's so funny that I laugh my head off.
这个太好笑了,以至我狂笑不已。
3. seem to do sth.
（在描述自己的感觉、想法、经历时用于缓和语气）好像，似乎；
eg. He doesn't seem to understand the gravity of the situation.
他似乎没有意识到形势的严重性。
eg. I can't seem to throw off this feeling of inertia.
我好像无法摆脱这种无力的感觉。