I can't help you, but my mom can.我不会帮你,但是我妈妈可以。I like this book, but it's too expensive.我喜欢这本书,但是它太贵了。I'd like to go to the cinema with you, but I am too busy now.我想和你一起去电影院,但我现在太忙了。
I want to buy a large house,but I don't have enough money.I want to travel around the world,but I don't have time.I want to go back to my childhood,but I can't.I want to sleep, but I haven't finished my homework yet.OK ?