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1、參考醫(yī)學(xué)英語共有16種時態(tài):一般現(xiàn)在時、一般過去時、一般將來時、過去將來時、現(xiàn)在進行時、過去進行時、將來進行時、現(xiàn)在完成時、過去完成時、將來完成時、現(xiàn)在完成進行時和過去完成進行時。另外四種時態(tài)較少使用。一般現(xiàn)在時與一般過去時時態(tài)名稱結(jié)構(gòu)常連用的詞主要用法一般現(xiàn)在時1 be動詞用am/is/are表示,之后接名詞,形容詞或介詞。sometimes;often;usually;every;always;never;once/twice/ a week/month/year;on sundays/mondays/.;一般現(xiàn)在時表示沒有時限的持久存在的習(xí)慣性的動作或狀態(tài),或現(xiàn)階段反復(fù)發(fā)生的動作或狀態(tài)2
2、行為動詞用v原形或v-s/es,引導(dǎo)疑問句和否定句,用do或dont;第三人稱時用does或doesnt,有does出現(xiàn)動詞用原形;第三人稱陳述句v后加s或es.一般過去時。1be動詞用過去式was或 were表示。yesterday;the day before yesterday;last week/month/year/.; ago;a moment ago;just now;on/in+過去的時間;在過去時間里所發(fā)生的動作或存在的狀態(tài)。2行為動詞用v-ed,陳述句,疑問句和否定句借助于did,有did出現(xiàn)動詞用原形。一般將來時與過去將來時時態(tài)名稱結(jié)構(gòu)常連用的詞主要用法一般將來時1 任何
3、人稱+will+v原形.tomorrow,the day after tomorrow;soon;next week/month/year/.;the week/month/year/. after next;on/in +將來的時間;in+一段時間;.即將發(fā)生動作或狀態(tài)。陳述句:i will fly to hongkong tomorrow.he will go with us.we will arrive in shanghai next week.否定句:i will never believe you again.he will not come tonight.we will not
4、 buy a car next year.一般疑問句:will you go there by train?will he come tomorrow?will they live a five-star hotel?2 is/am/are+going to+v原形,表示計劃打算做什么事情。陳述句:im going to go to hongkong by air.否定句:we are not going to buy a house here.一般疑問句:are they going to change their jobs?特殊疑問句:how are you going to tell h
5、im?過去將來時was/were going to +v原形多用在賓語從句中在過去將會發(fā)生的動作。陳述句:i was going to buy a computer.they told me that they were not going to go abroad.否定句:i was not going to buy a computer.任何人稱+would +v原形he said he would come in in shanghai.i said i would buy you a car one day.現(xiàn)在進行時、過去進行時時態(tài)名稱結(jié)構(gòu)常連用的詞主要用法現(xiàn)在進行時is/am/ar
6、e+v-ingnow;at present;at the moment;look!(放在句首);listen! (放在句首);表示現(xiàn)在( 指說話人說話時) 正在發(fā)生的事情。陳述句:im waiting for my boy friend.he is doing the housework at home now.we are enjoying ourselves.否定句:he is not playing toys.一般疑問句:are you having dinner at home?is tim cooking in the kitchen?特殊疑問句:what are you
7、doing now?where are they having a meal?過去進行時was/were+v-ingat that time;at this time yesterday;at+時間點+yesterday/last night;at that moment;過去一段時間正在發(fā)生的動作。陳述句:i was doing my homework at that time.we were having a party while he was sleeping.否定句:he was not sleeping at 11 oclock last night.一般疑問句: were you
8、 watching tv at that time?特殊疑問句: what were you doing at that moment?現(xiàn)在完成時、過去完成時時態(tài)名稱結(jié)構(gòu)常連用的詞主要用法現(xiàn)在完成時have/has+ p.p(過去分詞)already;just;before;yet(否定句中);ever;never;once/twice/for+一段時間;since +時間點;since+一段時間+ago;by+現(xiàn)在時間;so far; up to now; till now; until now;recently/lately;during/over/in thepast/last.用來表示
9、之前已發(fā)生或完成的動作或狀態(tài),其結(jié)果的確和現(xiàn)在有聯(lián)系。動作或狀態(tài)發(fā)生在過去但它的影響現(xiàn)在還存在;也可表示持續(xù)到現(xiàn)在的動作或狀態(tài)。簡單的說,就是動作已經(jīng)發(fā)生對現(xiàn)在造成明顯的影響。陳述句:i have already told davy. davy has known this matter.he has lived here for nearly 10 years.否定句:i havent finished my homework.tim hasnt come yet.we havent heard any news about him一般疑問句: has he worked here sinc
10、e he came here?特殊疑問句: how long have you worked in this company?特別注意:1. have/has always been+名詞/形容詞/介詞:總是或一直是什么樣子。he has always been a good father. i have always been busy.they have always been in america.2. have/has gone to:去了。he has gone to beijing.they have gone to the cinema.3. hav
11、e/has been to:表示去過或到過。i have been to canada. have you been to hongkong?where have you been?i have never been here.過去完成時had + p.p(過去分詞)過去的過去:by+過去的時間;表“過去某動作或時間以前”的時間狀語。動作發(fā)生在過去的過去。陳述句:he said he had told davy.they told us they had finished the work.he left the office after he had called davy.否定句:she
12、hadnt had dinner before she went out.一般疑問句:had she learnt english before she moved here?特殊疑問句:how many english words had he learnt by the end of last year?simple present 一般現(xiàn)在時simple past 一般過去時simple future 一般將來時句子結(jié)構(gòu):主語+v句子結(jié)構(gòu):主語+v-ed句子結(jié)構(gòu):主語+will+v. 句子結(jié)
13、構(gòu):主語+be going to+v i study english everyday. 我每天都學(xué)習(xí)英語. two years ago, i studied english in america. 兩年前,我在美國學(xué)英語. if you are having problems, i will help you
14、60;study english. 如果你在學(xué)習(xí)英語當(dāng)中,遇到問題,我將幫助你. im going to study english next year. 我明年將開始學(xué)習(xí)英語.present continuous 現(xiàn)在進行時past continuous 過去進行時future continuous 將來進行時句子結(jié)構(gòu):主語+be+doing句子結(jié)
15、構(gòu):主語+was/were+doing句子結(jié)構(gòu):主語+will be+doing 句子結(jié)構(gòu):主語+be going to+be+doing i am studying english now. 我正在學(xué)習(xí)英語. i was studying english when you called yesterday. 你昨天給我打電話的時候,
16、我正在學(xué)習(xí)英語.i will be studying english when you arrive tonight. 明晚你來的時候,我會正在學(xué)習(xí)英語. im going to be studying english when you arrive tonight。present perfect 現(xiàn)在完成時past perfect 過去完成時future perfect
17、60; 將來完成時句子結(jié)構(gòu):主語+have/has done句子結(jié)構(gòu):主語+had done句子結(jié)構(gòu):主語+will+have done 句子結(jié)構(gòu):主語+be going to+have donei have studied english in several different countries. 在一些國家,我已經(jīng)學(xué)習(xí)了英語.i had studied a little english before
18、i moved to the u.s. 在我搬去美國之前,我已經(jīng)學(xué)習(xí)了一點英語.i will have studied every tense by the time i finish this course. 在我完成這個課程的時候,我已經(jīng)能完成英語時態(tài)的學(xué)習(xí)了. im going to have studied every tense by the time i finish this course.present perfect continuous 現(xiàn)在完成進行時past perfect continuous 過去完成進行時future perfect continuous 將來完成進行時句子結(jié)構(gòu):主語+have/has been doing i have been studying english f
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