Ответ:
Объяснение:
At home, I must clean everything.
My best friend has to do housework.
At school, I have to require myself to respect teachers.
This week, I have to send an e-mail to my customer.
At the weekend, I must pass writing test.
When in a car, I should be careful.
When I was younger, I wasn't obliged to say something about it.