both的位置可以根據(jù)它的語法功能分為：
1 both of the pl 是一個名詞性質(zhì)的短語.作主語是在謂語之前,作賓語時在動詞之后.如：Both of the writers were born in Chang an.He picked up both of the passegers from the airport.
of the pl 可以變?yōu)椋簅f us/ them/you.也可以省略為：both
2 both (the) pl 中both相當于形容詞,作定語,放在名詞之前.如：both the brothers,both arms.
3 在名詞或代詞復(fù)數(shù)后作主語的同位語用,
1)沒有助動詞時,就放在謂語之前.如：They both work for the foreign company.The actresses both got into the lift.
2)有助動詞時,通常就放在第一個助動詞之后.如：They have both kept the secret.The managers are both in faour of the policy.
3)有助動詞,但助動詞后再沒有其它詞語時,就放在助動詞之前.如：How silly you both are!Have they seen the movie?Yes,they both have.
4)作賓語的同位語時,放在賓語之后.如：I took photographs of them both.
4 both ...and ...是一個連詞,用來連接并列的成分.如：She is both glad and sorry to see him.Both John and Jack were criticized by the boss.She was ashamed ,both for herself and for her sister.