Chuyển câu chủ động sang câu bị động thì hiện tại hoàn thành
Kerrie has paid the bill.The bill has been paid by Kerrie.I have eaten a hamburger.We have cycled five miles.I have opened the present.They have not read the book.You have not sent the parcel.We have not agreed to this issue.They have not caught the thieves.Has she phoned him?Have they noticed us?