were laughing, laughed
Je ne pense pas qu'ils ne riaient que par politesse.
I don't think they were laughing just out of politeness.
— Les Fraises sauvages (1957)
Tous les autres garçons riaient de lui.
All the other boys laughed at him.
On ne devrait pas rire de cela et pourtant ils riaient.
We shouldn’t laugh at that, and yet they were laughing.
The students laughed.