Lespolicierssontarrivéstroptard.
The police officers arrived too late.
Il m'aaidéquand j'enavaisbesoin.
He helped me when I needed it.
Ellemarchaittropviteet elle esttombée.
She was walking too quickly, and she fell.
TIP
Mixing it up
You can use both the imparfait and the passé composé in the same sentence. The imparfait describes the background info, and the passé composé describes what happened!
Nous faisions les devoirs quand notre mère est rentrée. We were doing our homework when our mother came home.
Il y avait beaucoup de monde dans le magasin quand elle est entrée. There were a lot of people in the store when she came in.
Tu pleurais encore quand je suis arrivée. You were crying when I arrived.