Duolingo Guidebook

我给你介绍，这是我最好的朋友。
Let me introduce you, this is my best friend.

他又高又帅。
He is tall and handsome.

我的姐姐不但聪明，而且漂亮。
My older sister is not only smart, but also beautiful.

虽然他不喜欢说话，但是喜欢笑。
Although he doesn't like to talk, he likes to smile.

你们在笑什么？
What are you laughing at?