名詞 yes:

1. an affirmative

1. Yes, I don't see why not.
   是的，我看不出有什么不好。
2. Answer yes or no.
   回答是或者不是。
3. Yes, it's still in my mind.
   是的，這事仍在我的記憶里。
4. Yes, monsieur.
   是，先生。
5. Yes, perhaps I'm wrong there.
   是的，在這點上也許我錯了。
6. Yes, you're quite right.
   是的，你很對。
7. Answer with a plain "yes" if you agree with me.
   如果你同意我的意見，就明白地回答“是”。
   如果你同意我的意見，就明白地回答“是”。
   如果你同意我的意見，就明白地回答“是”。

yes

adv.（副詞）
It is so; as you say or ask. Used to express affirmation, agreement, positive confirmation, or consent.
是：是這樣；如你所說或你所問。用來表達確信、同意、明確的證實或贊成
n.（名詞）
【復(fù)數(shù)】 yes.es
An affirmative or consenting reply.
是：確定或贊同的回答
An affirmative vote or voter.
贊成票或投贊成票者
v.tr.（及物動詞）
yessed,yes.sing,yes.es
To give an affirmative reply to.
說.是.：給…以肯定答復(fù)

來源：
Middle English
中古英語
from Old English gôse [so be it!]
源自 古英語 gôse [是這樣！]
probably gôa [so] * see i-
可能為 gôa [這樣] *參見 i-
soe [may it be so] * see es-
soe [但愿如此] *參見 es-

<注釋>The wordyes is a good example of how an ordinary and frequently used word can have a complex etymology. We can traceyes back to two Indo-European roots, .i-, a pronominal stem, and .es-, .to be.. From two extended forms of.i-, .y3m and .y3i, came the prehistoric Common Germanic forms.j3 and jai, which gave us Old Englishge3, an affirmative particle, the source of Modern Englishyea. The Indo-European root.es- is the source of our forms am and is. From the stem.so- used to make verb forms in the optative mood, a mood used to express a wish, came the Germanic form.sijai-, which gave us Old Englishsoe, .may it be so.. This form, unlike the sources ofam and is, died out, but before disappearing it had combined with Old Englishgôa to form the compound gôse, the ancestor of our wordyes. Thissoe was destined to have even more of a triumph. Until around '00yea was used to respond to positive expressions, whereasyes was used to respond to negative expressions. After that timeyes became a response to both positive and negative expressions, yea surviving primarily in voice votes.
yes 一詞是說明一個普通常用詞如何擁有一復(fù)雜詞源的極好例證。 我們可以追溯yes 到兩個印歐語詞根， 代名詞詞干i- 和 es- .是.。 從i-的兩種擴展形式，yam 和 yai， 形成了史前普通日耳曼語形式ja 和 jai, 它們又帶來了古英語中的肯定虛詞gea ， 這便是現(xiàn)代英語yea 的來源。 而印歐語詞根es- 是我們 am 和 is 兩形式的源頭。 以is- ，一個用于制造祈愿語氣動詞的詞干， 產(chǎn)生出日爾曼形式sijai-， 并由此形成了古英語sie, .希望如此.。 這種形式不象am 和 is 的詞源，已經(jīng)滅絕了， 但在消失之前，它已經(jīng)和古英語gea 混合形成復(fù)合詞 gese， 即我們的單詞yes 的前身。 這個sie 注定要獲取更大的勝利。 直至'00年左右，yea 還被用于回答肯定的陳述； 而yes 則用于回答否定陳述。 此后，yes 既可作肯定也可否定表達的回答， yea 則主要在口頭投票時使用