英語中的人稱代詞(Personal Pronouns)有主格、賓格和所有格之 分，如：
I, me, my ; he, him, his ; they, them,their等。
顧名思義，主格(The nominative case)用作主語，賓格(The objective case)用作賓語，所有格(The possessive case)則表示所有之物。
在實(shí)際運(yùn)用中，主格和賓格代詞有時會混淆。下面是常見的問題：
⒈在復(fù)合結(jié)構(gòu)里，人稱代詞的主格和賓格在單獨(dú)使用時，沒有問題，如很少人會犯下這樣的錯誤：
*(1)Wilcox spoke to I.
*(2)Her knew what had happened.
但在復(fù)合結(jié)構(gòu)中，錯誤就難免了，如：
*(3)Wilcox spoke to my friend and I.
*(4)He and her knew what had happened.
*(5)This is between you and he.
這種錯誤是可避免的。第一，在有介詞的復(fù)合結(jié)構(gòu)中，特別要注意，第二個人稱代詞，必須用賓語，如："for you and me"和 "between Maria and him".第二，試把復(fù)合結(jié)構(gòu)中的另一部分暫時用括號圍起來，那么該用的格就容易辨別了，如：
(6)This message is for (My father and) I or me.
(7)(Marry and) he or him went downtown together.
顯然的，(5)里的代詞是賓格的"me", (6)里的代詞是主格的"he".
⒉在比較結(jié)構(gòu)里，連接詞"as"或"than"后面，按理用主格式，但在口語中，人們常用賓格形式，學(xué)美式英語者，更是如此：
(8)a. You did as well as she.
b. You did as well as her.
(9)a. I am older than he.
b. I am older than him.
(a)和(b)兩種說法，都可接受。但如果"as"和"than"后頭分句的主語和詞動都要完整出現(xiàn)的話，這時的人稱代詞，就必須是主格，如下：
(10)You did as well as she did.
(11)I am older than he is .
此外，還有一點(diǎn)要注意，就是"as"和"than"后面雖然在語法上用主格好，用賓格也可，但是有時意思會有所不同。試比較(a)和(b)：
(12)a. Jason praised Maria more highly than I.
b. Jason praised Maria more highly than me.
(12)a和b都被接受，但(12)a等于(13)a，而(12)b等于(13)B：
(13)a. Jason praised Maria more highly than I did (= I praised Maria).
b. Jason praised Maria more highly than he praised me.
顯然，這兩句的深層意思大有差別。遇到這種情形，為了避免誤解，不妨根據(jù)要表達(dá)的意思用完整的句式表達(dá)出來。換句話說，必要的話，要用(13)這句子。
不然，把(13)a變成(14), (13)b變成(15)也可：
(14)I did not praise Maria as highly as Jason did.
(15)Jason did not praise me as highly as he praised Maria.
