She gave a shy laugh when she heard the joke.

They were laughing at the funny story.

Don't laugh at him, he's trying to learn.

His laugh echoed through the room.

I couldn't help but laugh at her silly expression.

She always makes me laugh with her jokes.

这些句子涵盖了不同的语境和用法，适合七年级学生在学习和使用laugh这个词汇时参考。