全面掌握代詞，除了要關注每種代詞的不同用法，還需要注意代詞及其先行項在“數”、“性”和“人稱”方面的一致關系。今天，小編先跟大家聊聊代詞及其先行項的在“數”方面一致。

代詞和物主限定詞單、復數形式的選擇通常取決于它們的指示對象，即先行項的單、復數形式。舉例來說，All members of the group have already made their decisions. 這里，all members是指示對象(先行項)，所以其后的代詞選用their。關于代詞單、復數形式的選擇，我們還需要注意以下幾點：

1. 先行項為every-，some-等復合詞時：語法一致原則，代詞一般用單數：

Anybody can come here if he is interested.

注：當先行項為everybody，everyone時，代詞一般用復數更為自然。

Everyone was clapping their hands.

當先行項為everything，anything，something，nothing時，代詞用單數。

Everything in the bag is broken, isn’t it?

2. 先行項為并列結構時：意義一致原則。

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.

3. 先行項為集體名詞時：意義一致原則。

The team has won its first game.

The team are now preparing themselves for the next game.

3. 先行項為“...+each”時：

若each在動詞后，代詞則為單數：They had each his own problem.

若each在動詞前，代詞則為復數：They each had their problems.