下線部を代名詞にMy sister is on the volleyball team.
答She is on the volleyball team.
主格（my sister → she）
下線部を代名詞にMy parents are in the brass band.
答They are in the brass band.
主格（my parents → they）
下線部を代名詞にYuki is good at soccer.
答She is good at soccer.
主格（Yuki → she）
下線部を代名詞にPlease call my brother tonight.
答Please call him tonight.
目的格（my brother → him）
下線部を代名詞にI often help Kate and Emi.
答I often help them.
目的格（Kate and Emi → them）
下線部を代名詞にDo you know Mr. Brown?
答Do you know him?
目的格（Mr. Brown → him）
下線部を代名詞にI use my classmates' computer sometimes.
答I use their computer sometimes.
所有格（my classmates' → their）
下線部を代名詞にThis is Ken's new car.
答This is his new car.
所有格（Ken's → his）
下線部を代名詞にThis computer is Emi's.
答This computer is hers.
所有代名詞（Emi's → hers）
下線部を代名詞にThis bike is Mr. Sato's.
答This bike is his.
所有代名詞（Mr. Sato's → his）