were putting, were placing
Tous se mettaient à rire.
Everyone started laughing.
Toutes se mettaient à rire.
They all started laughing.
S'ils mettaient moins de temps à sécher.
If only they took less time to dry.
— Picnic (1955)
Ils lui mettaient tout sur le dos.
They blamed everything on him.
Ils montaient la garde chaque nuit, ils mettaient des pièges, des filets.
They stood guard every night; they set traps and nets.
— Heureux comme Lazzaro (2018)
Ils mettaient même des draps sur leurs chevaux.
They even put sheets over their horses.