notadictionary.com
QUAND LA MOUCHE QUE TU CHASSES DEPUIS UNE HEURE SE POSE ENFIN SUR LE MUR...
→ “When the fly you've been chasing for an hour finally lands on the wall...”
QUAND — when → indicates the time something happens
LA MOUCHE — the fly → refers to the insect being chased
QUE — that → connects the chase to the fly
TU — you → the person doing the chasing
CHASSES — chase → present tense, 2nd-person singular of chasser; here it means 'you have been chasing'
DEPUIS — for (a duration) → used with a time period to show how long an action has been going on
UNE HEURE — an hour → one hour of time
SE POSE — lands / settles → reflexive form of poser, meaning the fly is coming to rest; se + pose = 'it lands' (reflexive sense)
ENFIN — finally → emphasizes relief or satisfaction after waiting
SUR — on → shows where the fly ends up
LE MUR — the wall → the surface the fly lands on
