After prepositions you will use stress/emphatic pronouns which are:
moi, toi, lui, elle, soi, nous, vous, eux , elles
The following lesson will give you more explanations -
I find students remember them well after the preposition 'chez':
Chez moi, chez toi, chez elle, chez lui, chez soi, chez nous, chez vous, chez elles, chez eux.
So in the examples you give,
Il est furieux contre elle = He is furious with her
Il est furieux contre lui = He is furious with him
Elle est furieuse contre elle = She is furious with her
Elle est furieuse contre lui = She is furious with him
It could be -
Nous sommes furieux contre elles = We are furious with them ( them in this case being several women)
Hope this helps!
I think the answer is that stressed pronouns are required after certain prepositions (including contre):
Moi, toi, lui, elle, nous, vous, eux, elles (advanced stress pronouns)
But then we have "Elle est furieuse contre lui" And the other example "Il est amoureux d'elle, et elle est amoureuse de lui". Both frases in the sentence have the preposition.
Perhaps I have not understood your question correctly.
Lui is the stressed pronoun for him.
Elle is the stressed pronoun for her.
Let me know what would make sense for you in those sentences.
It's tremendously confusing.
The fact is that there are different types of pronouns, and many of the words appear in all those different lists of pronouns (there is a nice table on this page: https://www.thoughtco.com/french-pronouns-1368927).
So lui means "to him" or "to her" if we are using an indirect pronouns, but when a stressed pronoun is required, then lui is used for both masculine and feminine!
Steve, just a correction -
There are feminine and masculine forms in the stress pronouns:
elle = feminine singular
lui = masculine singular
elles = feminine plural
eux = masculine, or a mixture of the two, plural
Yes - got them the wrong way round!
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