Questions & Answers about Madame, vous êtes très polie.
Why is the word vous used here if Madame is just one person?
Does vous always use the verb form êtes even when speaking to just one person?
If vous uses a plural verb, why doesn't the adjective polie have an s at the end for plural?
Adjectives always match the actual number of people you are describing. Since you are talking to exactly one woman, the adjective is singular. There is no s because there is only one person.
Why is there an e at the end of polie?
Adjectives change to match gender. Because you are talking to a woman, you add a feminine e to the base adjective poli. If you were talking to a man, you would drop the e and just write poli.