Il construisait la clôture depuis trois jours quand il a vu qu'elle empiétait sur le jardin.

Questions & Answers about Il construisait la clôture depuis trois jours quand il a vu qu'elle empiétait sur le jardin.

Why use the imperfect construisait instead of a past perfect tense for "had been building"?
When an action started in the past and was still continuing at another specific moment in the past, French uses the imperfect (l'imparfait) along with depuis. English uses "had been [doing]" + "for", but French treats it as an ongoing past state.
Why do we switch to the passé composé for a vu?
The passé composé is used for sudden, completed events that interrupt an ongoing background action. He was in the middle of building (construisait, imperfect) when the sudden realization happened (a vu, passé composé). The word quand (when) is a classic trigger for this interruption.
Why does elle mean "it" here instead of "she"?
elle refers directly to la clôture (the fence), which is a feminine noun. In French, personal pronouns must match the gender of the noun they replace, even for inanimate objects, rather than defaulting to a neutral "it".
Why is empiétait (was encroaching) in the imperfect rather than the passé composé like a vu?
Because the encroaching wasn't a sudden, completed event. It was an ongoing background state—the fence was simply sitting there, crossing the boundary—at the exact moment he noticed it.
Does the verb empiéter always need the preposition sur?
Yes, when you want to state what is being encroached upon or infringed upon, empiéter requires the preposition sur. You can think of it literally as stepping on someone else's territory.

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