you must be careful
you must be careful
when crossing street,you must be careful
You must be _(careful) than before.
you must be careful改为祈使句
You must always be careful with it .
When____the work,you must be careful.
you must be careful.为什么说careful没有be不能形成谓语,不是有must吗
you must be careful when you ___ with fireworks
you must be careful when you ( )the street
You must be careful when crossing the street.改为祈使句
you must be very careful because the traffic
改祁使句 you must be careful with your pronunciation