are的单数形式是什么 they
he/ she/ it is. they are是第三人称的复数形式，第三人称包含he/ she/ it. 第三人称单数的be动词用is. 第三人称单复数转换例句如下： They are very happy.（他们非常开心） He is very happy.（他非常开心） She is very happy.  (她非常开心) It's very happy.（它非常开心...
he/ she/ it is. they are是第三人称的复数形式，第三人称包含he/ she/ it. 第三人称单数的be动词用is. 第三人称单复数转换例句如下： They are very happy.（他们非常开心） He is very happy.（他非常开心） She is very happy.  (她非常开心) It's very happy.（它非常开心...