A)still的意思是還是（正句）,還不/還沒有（負(fù)句）等.它存有繼續(xù)的含意.
例∶1) It is 12 midnight,Daisy is still outside.現(xiàn)在是午夜12點(diǎn),Daisy還在外面.
例∶2) When we left that place,he was still inside the house.當(dāng)我們離開那個(gè)地方時(shí),他還在屋子里.
例∶3) Don’t worry,they are still young.They will have more time to learn.別擔(dān)心,他們還年輕,他們會(huì)有更多的時(shí)間學(xué)習(xí).
例∶4) I have reminded him to do that job.He is still hasn’t started it yet.我已經(jīng)提醒他做那份工作,他還是沒有開始做.
B)Yet的意思是還沒有,通常用在負(fù)句（Negative Statement）或是問句（Questions）.
例∶5) It is 5 o’clock and Judy hasn’t arrived yet.現(xiàn)在是五點(diǎn),而Judy還沒有到.
例∶6) I am starting.Is the dinner ready yet?我肚子餓,晚餐準(zhǔn)備好了嗎?
例∶7) I do not know which company I am going to work yet.我還不知道我要去那一間公司上班.
例∶8) They have not arrived yet.他們還沒有到.
注∶yet詞通常與Present Perfect Tense（has,have+第三動(dòng)詞,到目前為止的表達(dá)動(dòng)詞的用法）有密切的關(guān)系.
Still和yet的分別
Still：I called her 2 hours ago but she still hasn’t arrived.我兩個(gè)小時(shí)前有撥電給她,她還是沒有到.（她本來早就應(yīng)該到了）
Yet：I called her 2 hours ago but she hasn’t arrived yet.我兩個(gè)小時(shí)前有電話給她,她還是沒到.（我預(yù)了她,可是她還沒有到）
Already已經(jīng)
Already這個(gè)詞是放在句子的中間.這個(gè)詞的意思是已經(jīng)做了.Already是用在正句（Positive Sentences）
例∶9) Jolin has already done her work Jolin.已經(jīng)做完她的工作.
例∶10) Shall we eat lunch?I am already hungry.我們?nèi)コ晕绮秃脝?我已經(jīng)肚子餓了.
例∶11) We have already changed the project.我們已經(jīng)換了那個(gè)計(jì)劃.
例∶12) Kelvin and Cheng have already done their work.Kelvin和Cheng已經(jīng)做完他們的工作.
記得∶Already通常與Present Perfect Tense有關(guān).
Present Perfect Tense（到目前內(nèi)止動(dòng)詞的表達(dá)）