Questions & Answers about Grâce à sa bonne mémoire, Paul apprend vite.
In French, the possessive adjective agrees with the thing possessed, not with the owner.
Here, mémoire is a feminine noun, so French uses sa:
- sa mémoire = his memory / her memory
So even though Paul is male, sa is correct because mémoire is feminine.
For comparison:
- son livre = his/her book
- sa mémoire = his/her memory
French does not choose between his and her the way English does in this case. The context tells you whose memory it is.
Because bonne is an adjective, while bien is usually an adverb.
Here, you are describing the noun mémoire, so you need an adjective:
- une bonne mémoire = a good memory
You would use bien to modify a verb, adjective, or another adverb, not a noun:
- Il apprend bien. = He learns well.
So:
- bonne mémoire = correct
- bien mémoire = incorrect