Les couvre-lits sont dans la boîte. Je les ai pliés ce matin.

From Lesson 440:Plural compound nouns·French

Questions & Answers about Les couvre-lits sont dans la boîte. Je les ai pliés ce matin.

Why does only lits get an 's' in the plural compound noun couvre-lits?
In French compound nouns formed by a verb and a noun, the verb part (couvre, from couvrir) is invariable—it never takes a plural 's'. The noun part (lit) takes the plural 's' because it logically refers to multiple beds being covered by the multiple bedspreads.
What is the singular form of couvre-lits? Does it keep the 's' on lit?
The singular is un couvre-lit, with no 's'. Since one bedspread covers one bed, the noun part is singular. When the whole word becomes plural, the noun part becomes plural too. This is different from a word like un cure-dents (a toothpick), which always keeps its 's' because even a single toothpick cleans multiple teeth!
Why is there an 's' on pliés in the second sentence?
Because of past participle agreement! Normally, verbs conjugated with avoir in the passé composé don't change their endings. However, if a direct object comes before the verb, the past participle must agree with it in gender and number. Here, the pronoun les (replacing the masculine plural couvre-lits) comes before ai pliés, so plié gets an extra 's' to match.
Do you pronounce the 's' at the end of couvre-lits?
No, the final 's' is silent, just as it is in the standalone word lits. In spoken French, the only way you can tell this word is plural is by listening for the plural article les right before it.

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