"Elles sentent bonnes" is incorrect, why can't you change bon is this setting? Thanks :)
In this case, 'bon', acts as an adverb, not an adjective and doesn't agree with the subject.
You could say for instance -
Ces fleurs ont une bonne odeur.
but it is more French to say -
Elle sentent bon ( ou mauvais) = They smell good ( or bad)
Hope this helps!
Would love to see this noted in the lesson.
This is already mentioned in the lesson -
Note that, in the specific case of sentir, even though bon and mauvais are adjectives, these are fixed expressions, so bon and mauvais NEVER change (no agreement).
Sign in to submit your answer
Don't have an account yet? Join today
Test your French to the CEFR standard