Ответ:

1. why did you have to buy so many chairs?

2. You have to look carefully after that tree.

3.She doesn't have to correct my mistakes

4.We should invite cousins to the our wedding

5.She shouldn't go outside today without an umbrella

6.The boys must wash their socks every evening

7.My son mustn't play with a lighter

8.Can i have a day off?

9.You mustn't shout in the museum

10.Could he gone to the station

Объяснение:

Модальные глаголы, в твоём случае, should( используется для советов), must( указания), mustn't( запрет), can( разрешение), can't ( идентично с mustn't - запрет), have to( обязанность), could( то же, что и can, но в более официальной форме)