Breakdown of La paroi est constituée de liquide.
être
to be
de
of / from / any (in negative sentences) / about (concerning)
le liquide
the liquid
la paroi
the wall (inner, partition, side)
constituer
to constitute
Questions & Answers about La paroi est constituée de liquide.
Why do we use de instead of par to say "of/by liquid" in this passive sentence?
In the French passive voice, the agent (the thing doing the action) is usually introduced by par. However, verbs that describe a state, condition, emotion, or physical makeup—like être constitué (to be constituted/made up), être couvert (to be covered), or être entouré (to be surrounded)—use de. Since liquide describes the physical composition of the wall rather than an active agent performing a specific action, we use de.
What is the difference between une paroi and un mur?
While both can translate to "wall", un mur is usually a solid, structural, or architectural wall (like a brick wall or the wall of a house). Une paroi generally refers to a thinner partition, an inner surface, or a lining, such as the wall of a living cell, a blood vessel, a cave, or a glass container.
Why is constituée spelled with an extra -e at the end?
In the passive voice, the verb is always formed with être plus the past participle. Because it uses être, the past participle must agree in gender and number with the subject of the sentence. La paroi is feminine and singular, so we add an -e to the past participle constitué.
Why is there no article before liquide? Why isn't it du liquide?
When de is used to introduce the material something is made of (acting as the passive agent here), we drop the partitive article (du, de la, etc.) if we are speaking about the material in a general, uncountable sense. Therefore, it simplifies to just de liquide instead of using de + du.
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