Bonjour,
Réponse :
1. He didn't laugh at her.
2. I met him in Toronto.
3. He taught maths.
4.The show began at 8p.m.
5. He didn't change his mind.
6.They created their own business.
7. It didn't take me long.
8. He found her in the attic.
Explications :
Forme affirmative :
sujet + verbe ( au prétérit )
( verbes régulier :base verbale-ed / verbes irréguliers: à apprendre )
Forme négative :
sujet + didn't + base verbale
( pour tous les verbes: réguliers, irrégulier. Sauf 'be' )