本人分少- -passengers have to across the lin by footbrigeneed l

passengers have to --across---改cross-- the lin by footbridge.
need l feed the dog three times a day -----yes you--- need 改must---
you had better not----- to 去掉to-----go out because it is very hot outside now.
may l watch the football match before finishing my home work----no you ----may not--改musn‘t---
----Shall we have a meeting tomorrow?
---Ok,but we should be in a big meeting-room.

passengers have to across the lin by footbrige
改为：passengers have to cross the lin by footbrige

you had better not to go out because it is very hot outside now.
改为：you had better not...