unless是否可以引导,状语从句?如果可以,

unless是否可以引导,状语从句?如果可以,
unless是否可以引导,状语从句?如果可以,

unless是否可以引导,状语从句?如果可以,
如：I won’t have dinner until my mother comes back. I will write when I have finished the book. I will discuss this with you when we meet. 2 ) when we arrived at the station,the train has left. （when 强调“特定时间”既可以表示在某一点的时候,又可以表示在某一段时间内,主句与从句的动作或事情可以同时发生也可以先后发生） While he was having supper,he heard some one knock at the door. （while表示的时间是一段,而不是一点.从句中的动词一般要用延续性动词）） The runners started as the gun went off.(强调主句与从句的动作或事情同时或几乎同时发生） PS：如果主句表示的是短暂动作,而从句用延续性动词的进行时态表示在一段时间内正在进行的动作时,when,while ,as 可互换使用.如：When/While/As I was walking down the stre 3)连词before,after,since,until(till).当它们表示时间时,它们既是介词又是连词. 如：He usually drinks a cup of tea before/after he goes to school. before/after going to school. I have lived in Dalian since my son was born in 1999. since 1999. I will wait here until(till)you finish your job. until 8pm. 4 )When,while 都可以做并列连词,连接并列分句,这个时候,when表示“就在…的时候”,while表示“反而,可是”,表示转折. 如：One evening I was having my dinner,when an unexpected friend knocked my door. 常用句式：sb was doing sth when…；sb was about to/going to do sth when…；sb had just done sth when… She thought I was talking about her daughter, while ,in fact ,I was talking about my own daughter. 此外when还表示原因“既然” 如：It was foolish of you to take a taxi when you could
et,I came across an old friend of mine. 5)as soon as,immediately,directly,the moment ,the minute,no sooner…than…,hardly/scarcely…when,once 这些从属连词或副词引导有从句都表示从句的动作一发生,主句的动作随即发生,常译为“一….就…”.从句中用一般时态代替将来时态. 如：Once you remember it ,you will never forget it . The moment I heard the voice,I knew father was coming. PS： no sooner…than…,hardly/scarcely…when,这一结构的时态搭配, no sooner 与hardly/scarcely引导的主句谓语动词用过去完成时,而than与when从句中谓语用一般过去时.此外,当把no sooner和 hardly/scarcely提到句首时,就用倒装语序. 如：I had hardly got home when it began to rain. Hardly had I got home when it began to rain. 6)every time,each time,next time,the first time,any time ,all the time等名词短语用来引导时间状语从句,表示每当……,每次……,下次…..等等. 如：Every time I was in trouble ,he would come to help me out.
B、原因状语从句 常由because,since,as引导 I can’t go to school because I am ill. (because 表示直接的原因,着重点在从句,用于回答why,语气最强,可用在强调句型,否定句中) Since you are ill ,I will go alone.(since一般表示对方已知的,无须加以说明的既成事实的理由,全句的中心在主句,语气比because弱,常常译为“既然”) As it is raining hard ,we will not go hiking.(as表示十分明显的原因, 一般说明因果关系,着重点在全句,语气较弱,常常译为“由于”) 注意: for 是个并列连词,只能放在另一个并列分句后面,表示一种推理或解释,或用作附加说明,而不是指理由或原因,语气最弱,一般不放在句首,常常译成“因为” 如：The dawn （黎明）breaks ,for the birds are singing outside of the window. C、条件状语从句 常由if, unless, as long as来引导,一般情况下条件状语从句中用一般现在在替代将来时. 如： If I am not busy tomorrow,I will play football with you. You will not pass the exam unless you work hard on it. 注意:1）条件有真实和非真实条件两种,前者表现的或可能变为现实的条件,后者表非现实的或不可能或不大可能变为现实的条件,那么句中的条件从句和结果语句皆须用虚拟语气. I f we left now ,we should arrive in good time.（现在） If we had known the fact ,we wouldn‘t have been cheated.（过去） If you dropped the glass,it would break.（将来） 2）在书面语中,条件从句可以不用连词if,而将谓语中的式were,had 或should等移到主语之前. 如： Were you in my position,you would do the same. 3）if 从句可以省去主语和连系动词或助动词be 如：If (it is )necessary,call me. Send the goods now if (they are )ready. 4）注意if引导宾语从句和条件状语从句的区别 I don’t know if you have time .（宾语从句） If you have time ,please come to my office.（条件状语从句） D、结果状语从句 一般由so…that,such…that引导 It is so heavy a box that nobody can move it. It is such a heavy box that nobody can move it . So+many/much/few/little+名词＋that从句 Such+a lot of/lots of+名词+that从句 The little boy is young ,so that he can’t go to school himself. The little boy is too young to go to school himself. The little boy is not old enough to go to school himself. (当主,从句的主语一至的时候,同时从句中有情态动词时,可以互换) E、目的状语从句 一由so that, in order that 引导 I will speak slowly so that you can understand me. I get up early in order that I can get school on time.=I get up early in order to get school on time. PS:for fear that,in case 与lest这些从属连词引导的目的状语从句中谓语动词要用虚拟语气,相当于so that …not 如：The boy hid himself behind the tree in case/for fear that his father should see him. F、比较状语从句 一般是由as…as , than ,not as/so …as等引导 I am taller than her. G、让步状语从句 常由although,though ,even if (even though),however(no matter how ),what ever,whenever,whoever,whichever来引导.although与though一般可以互换,都可能和yet,still或nevertheless连用,但不能与but连用. 如：John continued to work hard even if (even though)he felt sick. Whatever (no matter what )you do, I will support you. PS：whatever这一类的词还可引导名词性从句,这个时候不能变成no matter what. 如：I will do whatever you tell me to .（宾语从句） He is unhappy though/although he has a lot of money. PS：though还可用做副词,放在句末,意为：可是然而. You answer as if you did not know the rule. He treats me as if I were his bother. It seems as if it is going to rain.(真实） I、地点状语从句 1）常由where,wherever引导 I will go where work is hard. 2）Where there is a will ,there is a way.（表示抽象条件的含义,从句通常放在句首） 3）where 引导定语从句和状语从句的区别 You had better make a mark where you have any questions.（状语从句） You had better make a mark at the place where you have any questions.（定语从句）