Réponse:
Hello,
a. My best friend told me such a good joke that we all burst into laughter.
b. We watched a TV show with Stephen Fry last night! We had a really good laugh.
c. When I understood the Marmite advert, I just couldn't stop laughing.
d. Try not to laugh when he tells you, he's so easily offended.
e. Some of the cracker jokes we had were laughable.
There you go, I hope my answer helped you :)