We must __the documents when you go to bed at 9:30 p.m.--yes

Must we go to see a doctor at once when we have the flu?Yes, You don't have to go to bed at 10 P.M一般现在时 You don't have to go to bed at 10 p.m.(改为同义句） Why must we go to bed? You don't have to go to bed at 10p.m改为同义句怎么改? 选择 we must go to bed ——night A when B before when you go to bed at night ,you should say to your parents' ---when do you usually go to bed at night?----at ( ) eleven. When did you go to bed last when did you go to bed? it is 9:30p.m.children!__ is time to go to bed I go to bed at 8 p.m.in the morning这句话意思