Breakdown of Chaque couche est revêtue de fibres.
être
to be
de
of / from / any (in negative sentences) / about (concerning)
chaque
each / every
la couche
the layer
Questions & Answers about Chaque couche est revêtue de fibres.
Why do we use de instead of par to introduce the agent in this passive sentence?
In the passive voice, French typically uses par for specific, dynamic actions. However, de is used when the verb describes a state of being, a description, or an emotion. Here, est revêtue describes the physical state of the layer being covered, so it takes de. Notice that in English, this often translates to "with" rather than "by".
Why is there an extra e at the end of revêtue?
Because this sentence is in the passive voice, which is always formed with the auxiliary verb être. When using être, the past participle must agree in gender and number with the subject. The subject Chaque couche is feminine singular, so the past participle revêtu needs a feminine e at the end.
Why is there no article before fibres? Why not des fibres?
Does the verb revêtir have something to do with clothing?