不多余,這是傳統(tǒng)英語中最正規(guī)的說法.
其實than是個連詞,后面接的是比較狀語從句,這個從句往往以省略句的形式出現(xiàn),如果把它補充完整,就是：
My home is farther from the school than yours is far.
He is older than I am old.
但實際上沒有人這樣說.人們都會省略與主句相似的成分,有的人覺得省略得太厲害了就不正規(guī)了,就保留系動詞be；但口語中大多數(shù)人連 be動詞都省略的；更有甚者,有的人把than后面的從句的主語都改成賓格了.如：
Bill is shorter than I （am). = Bill is shorter than me.
She is as slim as I (am). = She is as slim as me.