英语翻译

问题描述:

英语翻译
1.We must keep quiet when others answer questions(改为祈使句)
__ __when others answer questions
2.They must finish their homework before Friday(改为同义句)
They__ __finish their homework before Friday
3.LinTao isn't doing his homework now(用on Saturdays替换now改写句子)
LinTao__ __his homework on Saturdays.

Keep quiet
have to
didn't do