规则(8)：特殊动词随主词的变化。

　　英文中，有些动词因主词不同而改变，verb to be是其中之一，因此，我们必须记得以下的规则：

　　第一人称 第二人称 第叁人称

　　现在式 单数 I am You are (He，She，It)is

　　复数 We are You are They are

　　过去式 单数 I was You were (He，She，It)was

　　复数 We were You were They were

　　Verb to have也有类似的变化：

　　第一人称 第二人称 第叁人称

　　现在式 单数 I have You have (He，She，It)has

　　复数 We have You have They have

　　过去式 单数 I had You had (He，She，It)had

　　复数 We had You had They had