Nobody has paid for the tickets, have they?

\(\Rightarrow\)the tickets

the secretary din't reply me for ten days

\(\rightarrow\)no reply

how old do you think this building is?

\(\rightarrow\)when

chuyển câu sau sang câu bị động

1.he didn't remember that he had been ordered to appear before the judge

\(\Rightarrow\) he had no recollection of.......................................................................