Bonjour
respond to the question using a DIRECT object pronoun
Charles a entendu sa mère ?
Oui, Charles l'a entendue.
OR
Non, Charles ne l'a pas entendue.
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The direct object pronoun is l'
It replaces the direct object : "sa mère" => feminine singular noun
fem. sing. pronoun = "la"
"la" changes in l' because the following noun begins with a vowel.(is a vowel = a)
The past participle with "avoir" agrees with the direct object ONLY if this direct object is before the verb.
Charles a entendu sa mère. (the direct object "sa mère" is after the verb.
Charles l'a entendue. (The direct object (pronoun l') is before the verb ► the past participle agrees)
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hope this helps ☺☺☺