這幾個(gè)詞都可以作副詞,still,是仍然,還是之意；yet是不過(guò),然而,之意；already是已經(jīng),已然之意.
1,still adv.仍然；更；靜止地
adj.靜止的,不動(dòng)的；寂靜的,平靜的；不起泡的
n.寂靜；劇照；蒸餾室
conj.仍然；但是；盡管如此
vt.蒸餾；使…靜止；使…平靜下來(lái)
vi.靜止；平靜；蒸餾
它的意思較多,用法也復(fù)雜,但是平常英語(yǔ)中,僅用作副詞狀語(yǔ),幾多反而混.
如1.Are you still with me?我的話(huà)你仍能聽(tīng)懂嗎?
2.Six months passed and still we had no news of them.六個(gè)月過(guò)去了,而我們還沒(méi)有關(guān)于他們的消息.
3.She still kept up with her classmates after graduation.畢業(yè)后她仍然與她的同學(xué)保持聯(lián)系.
2.yet adv.還；但是；已經(jīng) conj.但是；然而
(副詞)She didn't realize her mistake yet.她還沒(méi)有認(rèn)識(shí)到她的錯(cuò)誤.
（連詞）I don't eat much,yet I am a size 16.我吃得不多,然而我是個(gè)穿16號(hào)的人.
3.already 詞性很單一,用法也不復(fù)雜 adv.已經(jīng),早已；先前
Already the round sun was setting.圓圓的太陽(yáng)已經(jīng)要落山了.另外這個(gè)詞的英語(yǔ)用法,你可以看一下：Already is often used to add emphasis or to suggest that it is surprising that something has happened so soon.They were already eating their lunch.If you say that something is still happening or is still the case,you are usually emphasizing your surprise that it has been happening or has been the case for so long.She was still looking at me...There are still plenty of horses around here.You use yet in negative sentences and in questions.It is often used to add emphasis,to suggest surprise that something has not happened,or to say that it will happen later.Have you seen it yet?...The troops could not yet see the shore...It isn't dark yet.In British English,already and yet are usually used with the present perfect tense.I have already started knitting baby clothes...Have they said sorry yet?In American English,a past tense is commonly used.She already told the neighbors not to come...I didn't get any sleep yet.This usage is becoming more common in British English.
愿能給你些許幫助.