1.= Our favorite sport is football.= Football is our favorite sport.
2.many 可以换写成 a lot of 或 lots of；
on Saturdays 可以换写成 every Saturday
还可以直接变成：Many people are in the shops on Saturdays.
3.= My brother is a member of the tennis club.
= My brother plays for the tennis club.
4.翻译：It's time for after-class activities.Let's go to the playground.
或：It's time to have after-class activities.Let's go to the playground.
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