3

Since vous can refer to a plural subject as well as a formal singular subject, I'm wondering whether adjectives need to always treat it as plural.

So is the following correct, if the subject is formal singular?

Vous êtes allergique aux chats.

Or does it have to be:

Vous êtes allergiques aux chats.

--even though the subject is singular?

4

No. The adjectives in this case follow notional or semantic, not purely grammatical agreement. The verb goes in the plural, but the adjectives go in the singular.

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