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1，yet放句尾是什么意思yet放句尾一般是用在否定句中，以加強(qiáng)語(yǔ)氣，可以不翻譯！已經(jīng)的意思

2，already的用法1. 表示“已經(jīng)”，通常用于肯定句，不用于否定句或疑問(wèn)句(此時(shí)要用yet ) 。如：He has already started. 他已經(jīng)動(dòng)身了。Has he started yet?　他動(dòng)身了嗎？He hasnt yet started. / He hasnt started yet. 他還沒(méi)有動(dòng)身。2. 有時(shí)也用于疑問(wèn)句，但往往含有問(wèn)話人希望得到一個(gè)肯定回答或含有驚訝之意。如：Has she gone to bed already?　她不是已經(jīng)上床了嗎？Is he back already他怎么已回來(lái)了？3. 一般說(shuō)來(lái)，already 不用于否定句，但它有時(shí)可用于否定的條件狀語(yǔ)從句中。如：If he hasnt seen the film already, he may get the ticket. 假若他還未看過(guò)這電影，他呆以弄到票的。4. 與already 連用的時(shí)態(tài)：(1) 與行為動(dòng)詞的完成體連用。如：He has read the book already. 他已讀過(guò)這本書。By this time tomorrow Ill have finished the job already. 到明天這個(gè)時(shí)候，我將已做完這工作。(2) 與行為動(dòng)詞的進(jìn)行體連用。如：He is already working. 這已經(jīng)在工作了。When I came in, he was already laying the table. 我進(jìn)來(lái)時(shí)，他已在擺桌子了。(3) 與持續(xù)性動(dòng)詞或狀態(tài)動(dòng)詞的一般現(xiàn)在時(shí)或一般過(guò)去時(shí)連用。如：Its already late. 已經(jīng)遲了。He already knew about it. 那時(shí)他已知道此事了。

3，過(guò)去完成時(shí)already的用法疑問(wèn)現(xiàn)在完成時(shí) 一、定義：表示過(guò)去發(fā)生的事情對(duì)現(xiàn)在造成的影響和結(jié)果。二、結(jié)構(gòu)：have /has＋動(dòng)詞的過(guò)去分詞（否定形式在have /has后加not，疑問(wèn)句將have /has提前）三、常見(jiàn)標(biāo)志詞Already,yet,ever,never,before,lately,so far 等。四、用法 1. 過(guò)去發(fā)生的動(dòng)作對(duì)現(xiàn)在造成的影響。I have lost my pen.我把鋼筆丟了。（結(jié)果：我現(xiàn)在無(wú)鋼筆用） 2. 過(guò)去的動(dòng)作或狀態(tài)持續(xù)到現(xiàn)在并且已經(jīng)完成。She has had this pen for two weeks.她買這支鋼筆已有兩星期了。3. 現(xiàn)在完成時(shí)表示將來(lái) 。Ill wait until he has finished his work.我等到他把工作做完。備注: 句型轉(zhuǎn)換 ① I have finished my homework.（肯定句）我完成了我的作業(yè) 。I have not （havent）finished my homework.（否定句）我沒(méi)有完成我的作業(yè) 。Have you finished your homework？（一般疑問(wèn)句）你完成你的作業(yè)了嗎？ ② I have been there before.（肯定句）我以前去過(guò)那里。I have not （havet）been there before.（否定句）或 I have never been there before. 我以前從未去過(guò)那里。Have you been there before? 或Have you ever been there before? 你以前曾去過(guò)那里嗎？現(xiàn)在完成時(shí) 一、定義：表示過(guò)去發(fā)生的事情對(duì)現(xiàn)在造成的影響和結(jié)果。二、結(jié)構(gòu)：have /has＋動(dòng)詞的過(guò)去分詞（否定形式在have /has后加not，疑問(wèn)句將have /has提前）三、常見(jiàn)標(biāo)志詞Already,yet,ever,never,before,lately,so far 等。四、用法 1. 過(guò)去發(fā)生的動(dòng)作對(duì)現(xiàn)在造成的影響。I have lost my pen.我把鋼筆丟了。（結(jié)果：我現(xiàn)在無(wú)鋼筆用） 2. 過(guò)去的動(dòng)作或狀態(tài)持續(xù)到現(xiàn)在并且已經(jīng)完成。She has had this pen for two weeks.她買這支鋼筆已有兩星期了。3. 現(xiàn)在完成時(shí)表示將來(lái) 。Ill wait until he has finished his work.我等到他把工作做完。備注: 句型轉(zhuǎn)換 ① I have finished my homework.（肯定句）我完成了我的作業(yè) 。I have not （havent）finished my homework.（否定句）我沒(méi)有完成我的作業(yè) 。Have you finished your homework？（一般疑問(wèn)句）你完成你的作業(yè)了嗎？ ② I have been there before.（肯定句）我以前去過(guò)那里。I have not （havet）been there before.（否定句）或 I have never been there before. 我以前從未去過(guò)那里。Have you been there before? 或Have you ever been there before? 你以前曾去過(guò)那里嗎？