"it"的复数形式是 they或 them。当"it"作为人称代词主格时，它的复数形式是"they"，并且"they"通常用作主语，放在它所指代的名词之后。当"it"作为人称代词宾格时，它的复数形式是"them"，"them"通常用作宾语，跟在谓语之后，常放在句子末尾。

例如：

1. They went to the store.

2. Put them away.

3. I tried the doorknob and it turned.

4. I'm not going to let them get one over on me.