All members of the group have already made their decisions. 這裏，all members是指示對象（先行項），所以其後的代詞選用their。關於代詞單、複數形式的選擇，我們還需要注意以下幾點：
Anybody can come here if he is interested.
Everyone was clapping their hands.
Everything in the bag is broken, isn』t it?
My friend and roommate has done well in her exam, so she is happy now.
My friend and roommate have agreed to lend their bikes to me.
The team has won its first game.
The team are now preparing themselves for the next game.
若each在動詞后，代詞則為單數：They had each his own problem.
若each在動詞前，代詞則為複數：They each had their problems.