on time:在某個時間點上的準時,例如：Please hand in your homework on time.
in time:在某個時間段裏的準時,例如：Please go to school in time.
樓上的punctual是形容詞,意為準時的,守時的,精確的
on time:在某個時間點上的準時,例如：Please hand in your homework on time.
in time:在某個時間段裏的準時,例如：Please go to school in time.
樓上的punctual是形容詞,意為準時的,守時的,精確的