✨ ベストアンサー ✨
①Is French taught by them in your school?
②The dog was named Andy by him.
③What language is spoken by them in Australia?
④A book was gaved to Bill by his uncle.
⑤The poor people is usually taken care of by Mrs.White.
となると思います。
基本的に元々の文の目的語を主語にして、元々の主語をbyの後に置きます。
間違っていたらすみません💦
ありがとうございますm(_ _)m