$\text{12.}$ Their feelings have been shared with us since 2012.
$\text{13.}$ His math ability hasn't been improved for a fortnight.
$\text{14.}$ This road of ages hasn't been used.
$\text{→}$ Khi chuyển sang câu bị động, có nobody ⇒ là câu phủ định và bỏ nobody
$\text{→}$ S là this road còn this road of ages là 1 cụm N nên đi liền ⇒ has
$\text{15.}$ An interesting film has just been seen.
$\text{16.}$ He has been met for the first time.
$\text{→}$ This is the first time + HTHT = HTHT + for the first time.
$\text{17.}$ A boring book has never been read by Ba before.
$\text{18.}$ Ha Long has never been drawn before.
$\text{* Form:}$ Câu bị động thì HTHT:
$\text{S + have/ has + Ved/ P2 + (by).}$
$\text{→}$ have dùng với S số nhiều: I/ we/ you/ they/ ...
$\text{→}$ has dùng với S số ít: he/ she/ it/ ...
$\text{→}$ I/ we/ you/ they/ he/ she/ it/ people/ someone thì thường ko dùng by