Since用法 before用法 it is句型與there be固定句型

1、.,Since/before/it is+adj/n+doingthere be固定句型,.,It is + 一段時(shí)間 + since從句 關(guān)于這個(gè)句型要注意以下幾個(gè)方面(時(shí)態(tài)搭配和辨別v.是延續(xù)性v.還是短暫性v.) 1.it is/has been +時(shí)間段+ since sb. have done(該v.必須為延續(xù)性v.,翻譯時(shí)直譯) eg. It is 5 years since I have lived here. (live為延續(xù)性v.故直譯為：自從我住在這兒已經(jīng)5年了。) 2. it is/has been +時(shí)間段n.+ since sb. did(如v.為短暫性v./瞬間性v

2、. 翻譯時(shí)直譯,如為延續(xù)性v./表示狀態(tài)詞 翻譯時(shí)反譯) It is 5 years since I lived here. （live為延續(xù)性v.故反譯為我已經(jīng)5年不住這兒了。） It is 3 years since I smoked. （smoke為延續(xù)性v.故反譯為我已經(jīng)3年不吸煙了。）,.,I havent heard from him since he lived in London. I havent heard from him since he has lived in London.,Since 從句中的謂語動(dòng)詞是延續(xù)性動(dòng)詞或狀態(tài)動(dòng)詞，過去時(shí)態(tài)表示動(dòng)作或狀態(tài)的結(jié)束，現(xiàn)在完成

3、時(shí)表示動(dòng)作或狀態(tài)的開始并延續(xù)至今：,(他已不在London，從他離開London之時(shí)起到現(xiàn)在我就沒有收到過他的來信),(他還在London,從他搬到London起到現(xiàn)在我就沒有收到過他的來信),.,1) It is / has been ten years since he left Beijing. 自從他離開北京已經(jīng)十年了。 2) It is / has been ten years since he was a doctor. 他不當(dāng)醫(yī)生已經(jīng)十年了。 3) its three years since I smoked. 我不吸煙有3年了。 4) its three years since

4、 I began to smoke. 我抽煙有三年了。 5）It is 3 days since the accident happened. （happen為短暫性v.故直譯為：自從這場車禍發(fā)生已經(jīng)有3天了。）,.,It was+一段時(shí)間+since從句,It was+一段時(shí)間+since從句 從句用had done）,主句用一般過去式. It had been+一段時(shí)間since 從句（did），主句had done It was three years since Jack had been a teacher. It had been three years since Jack wa

5、s a teacher. 杰克不當(dāng)老師已有3年了,.,1）在 “It was + 一段時(shí)間 + before從句句型中，若主句是一般過去式，從句也是一般過去式時(shí)： 若主句是肯定句，翻譯成“過了多長時(shí)間之后才”例：It was long before they found their son.過了很久他們才找到他們的兒子。 若主句是否定形式，翻譯成“沒過多久就”例：It was not long before the couple met again.沒過多久這對夫妻就見面了。,.,2)在“It will be + 一段時(shí)間 + before從句”句型中，若主句是一般將來時(shí)，從句也是一般現(xiàn)在時(shí)：

6、若主句是肯定句，翻譯成“要過多長時(shí)間之后才”例： It will be half a year before I come back.半年后，我才回來。 若主句是否定形式，翻譯成“用不了多久就”例： It wont be long before we meet again.我們不久就會見面。,.,It is+名詞短語.+ doing It is + no use, no good (fun, a great pleasure, a waste of time, a bore.)等名詞+doing sth.It is no good objecting.反對也沒有用。It is a great

7、fun playing football打籃球很有趣。It is a waste of time trying to explain It is+adj+doing It is + useless (nice, good，interesting, expensive等形容詞)+ doing sthIt is useless speaking.光說沒用。It is nice seeing you again真高興又遇到了你。,.,1. There is no doing 結(jié)構(gòu)。其意為“不可能”、“無法”： Theres no denying the fact. 這一事實(shí)不容否認(rèn)。 There i

8、s no getting over the difficulty. 這困難無法克服。 2. There is no difficulty in doing sth. 結(jié)構(gòu)。意為“做某事沒有困難”： There is no difficulty in finding his office. 找到了他的辦公室沒費(fèi)一點(diǎn)勁。 There was no difficulty in carrying out the plan.,there be結(jié)構(gòu)的九個(gè)慣用句型,.,3. Theres no doubt 結(jié)構(gòu)。意為“毫無疑問”： There is no doubt of his success. 4. T

9、here is no hurry (to do sth) 句式。其意為“不用急(于做某事)”： Theres no hurry to return the book. 5.Theres no need for結(jié)構(gòu)。其意為“不需要或不必要”： There is no need for help. 不需要幫助。 There is no need for you to go. 你沒有必要去。 6. There is no question about.結(jié)構(gòu)。其意為“是毫無疑問的”： Theres no question about his success. 毫無疑問他會成功。,.,7. There is no question of doing sth 句式。其意為“做某事是不可能的”： There is no question of his coming. 他不可能會來。 8. There is no sense in doing sth 結(jié)構(gòu)。意為“做某事沒有道理