B：I want to take off my shoes. There are some sand in my shoes.
我想要脱鞋。我鞋里有沙子。
untie /?n?ta?/ v. 解开，松开；解除
把鞋带清洗干净 clean shoelaces
A：I have a headache. Could you do me a favor and clean my shoelaces?
我头痛。你能帮我个忙，把我的鞋带清洗干净吗？
B：I'm sorry, but I've got to prepare for my coming exams.
我很抱歉，但是马上就要考试了，我得准备准备。
favor /?feiv?/ n. 恩惠，好意
prepare /pr??pe?(r)/ v. 准备，预备
◆ prepare for sth 为某事做准备
把鞋带拧干 wring shoelaces out
