Bonjour
Mettre à la voix passive
1- They play loud rock music in my favourite café.
Rock music is played loud in my favourite café.
2- People often eat bread with butter and jam.
Bread is often eaten with butter and jam.
3- At my school they serve lunch at 12: 30 every day.
Lunch is served at 12:30 every day at my school.
4- People in Britain eat a lot of sweets and chocolates.
A lot of sweets and chocolates are eaten in Britain.
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Effectivement, le complément d'agent n'est précisé que lorsque celui ci est vraiment indispensable à la compréhension de la phrase.
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Bonne fin de journée ☺☺☺