代詞的存在是為了避免重復(fù)。
1.Mary is pretty;so is her sister.
(Mary很漂亮,她妹妹也一樣。)
2. Mary speaks French; so does her sister.
(Mary說(shuō)法文,她妹妹也一樣。)
3.Mary is pretty;she is also smart.
(Mary很漂亮,她還很聰明。)
名詞的代詞叫做代名詞。代名詞所代替的名詞叫先行詞。代名詞和先行詞人稱和單復(fù)數(shù)要一致。代詞必須有且只有一個(gè)先行詞,避免多個(gè)造成意思混淆。