all , both, 表示“都”，“全部”。
(1) both指兩個(gè)人或物，而all指三個(gè)以上的人或物，在句中都可作主語(yǔ)、賓語(yǔ)、表語(yǔ)、同位語(yǔ)或定語(yǔ)。
Both of us want to go. 我們兩人都想去。
All of us should work hard.我們都應(yīng)努力工作。
(2) both和all都可直接修飾名詞；名詞前如有限定詞時(shí)，其前只能用both of或all of。
Both brothers are clever. 兄弟倆都聰明。
Both of the books are useful.兩本書都有用。
(3) both和all在句中的位置是位于be動(dòng)詞之后，行為動(dòng)詞之前，如有情態(tài)動(dòng)詞或助動(dòng)詞，則位于情態(tài)動(dòng)詞或助動(dòng)詞與主動(dòng)詞之間。
We are all here. 我們都來了。
[特別提醒]
(1) both的反義詞是neither, all的反義詞是none。
Both of us are not doctors. 我們倆并非都是醫(yī)生。 (部分否定)
Neither of us is a doctor. 我們倆都不是醫(yī)生。(全部否定)
All of the books are not helpful. 并非所有這些書都對(duì)人有幫助。(部分否定)
相同點(diǎn)：都可以作形容詞、代詞，如(都是詞霸上的例子)
1. Both guests have arrived. Both the books are torn. Both her fingers are broken.
All the windows are open. Deal all the cards.
注意：both和all作形容詞修飾名詞，在有冠詞的情況下放在冠詞前，這一點(diǎn)和其他形容詞不同。例如，all the world 和 the whole world
2. Both were candidates. We are both candidates. Both of us are candidates.
All that I have is yours. We are all Chinese. All of us are sick.
3. 與否定詞“not”連用時(shí)只表示部分否定，而且不要被“not”靈活的位置迷惑，應(yīng)理解為“不是所有的…都…”
不同點(diǎn)：both可作連詞，all可作副詞，如
1. both men and women; an attorney well regarded for both intelligence and honesty.
2. a room painted all white; directions that were all wrong. all能修飾形容詞
2. 數(shù)量上：both固定是“兩、雙”，而all表示“三個(gè)或三個(gè)以上”
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