Răspuns:
Answers 1-4 are OK. However, you should consider revising answers 5 and 6.
Explicație:
before the healing is not can be
the order must not can
the customer may not can
My neighbour must finish his exams, before he can go to a faculty
We must prepare the base and the toppings before we can bake a cake .After the pizza is cooked, the restaurant delivers it
I need to start writing books before I can become a successful author.
The patient must take his medication before the healing can be completed
The order can be delivered and then the customer can pay for it
