5. Grammar and writing are taught to us.
6. The electric light bulb was invented by Thomas Edison.
7. Lan's friends are going to be invited to her birthday party.
8. Food should be kept in the refrigerator to keep it fresh.
9. The door of the classroom could not be opened by Lien.
10. That old building must be repaired.
Công thức chung của passive
BE + PAST PARTICIPLE
modals + be V3 = should/may/might/.... + be V3
***place .... by sb...time (Thứ tự cho các adv Ở cuối câu)
By RoseanneParkBLINK
Best wishes ^>^