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Before的详细用法总结

  Father was behind time.

  爸爸来晚了。

  3)behind用于某些成语:

  Don’t talk behind people’s backs.

  不要在背后议论人。

  He has been behind the scenes.

  他一直在幕后操纵。

  Sorry,but we’re behind the schedule.

  对不起,我们落在计划后面了.

  You are behind the times with your information.

  你了解的情况都过时了。

  You’re behind the times.

  你落在时代后面了。

  The airplane was behind time.

  飞机晚点了。

并列连词和连词短语

  并列连词用来连接平行的词、词组或从句。常见的连词有and ,but ,or ,so ,both…and , either…or ,neither…nor , not only… but also 等。

  1. and

  1).and 表示 “和、且”在肯定句中连接并列的成分。

  He is laughing and talking .

  2).祈使句+ and …… , “and” 表示“那么”之意。= If……

  Study hard , and you will succeed .= If study hard , you will succeed .

  2. but

  表示转折关系的连词,意为“但是”

  He is poor ,but honest .

  3. or

  1).or 有 “或”的意思,表示一种选择

  Would you like tea or water ?

  2). “祈使句……,or …” or 表示否则。= If …not …, ……. .

  Study hard , or you will fail. = If you don't study hard , you will fail .

  3).or 用在否定句中表示并列关系。

  He can’t read or write .

  4. both

  1).both “两者都”, 后面的名词、动词都用复数。

  Both the answers are right .

  2).both of ….

  Both of us are students .

  3).both …and…

  Both you and she are right .

  5. either/ either …or

  1).either “两者当中任何一个”,后有of 时接名词的复数形式,无of时接单数名词,动词用单数形式。

  You may wear either of the hats.

  2).either …or… “不是……就是……,或者

  ……或者…….”动词与临近的主语保持一致。即 “就近原则”.

  Either you or he has to go = Either he or you have to go .

  6. neither /neither …nor…

  1).neither “两者当中都不”,后有of 时接名词的复数形式,无of时接单数名词,动词用单数形式。

  Neither of the answers is right .

  2).neither ….nor… “既不…….也不……”动词与临近的主语保持一致。即 “就近原则”.

  Neither you nor I am right .= Neither I nor you are right .

介词before, by的用法

  介词用于名词、代词或相当于名词的其他词类、短语或从句前,表示与其他成分的关系。介词可以与名词、形容词和动词搭配表示不同的意义。

  2. 表示某一时间的介词

  2 )before, by

  before表示某一时间之前。比如:

  We finished the work before noon.

  我们中午前完成了工作。

  He’ll be in his office before 5 p.m.

  下午五点之前他将在办公室。

  They returned to their college before September 1.

  九月一日前他们回到了大学。

  by 表示到某一时间为止。 比如:

  By last Saturday, we had had two football matches with Class Two.

  到上星期六为止,我们和二班进行了两场足球赛。

  We had built three bridges over the river by the end of 1994.

  到1994年底我们在河上造了三座桥。

  By the end ofthis term, I had learned 400 words.

  到这个学期结束的时候,我已经学了400个单词。

  欢迎转发~~~发动大家来 做作业,学英语 ~

  英语作业20181106

  一、选择填空。

  7. People attended many celebrations ___ Christmas.

  A. at B. for

  C. since D. on

  8. The flight will depart at 10:35 a.m.and you must get to the airport ___ 8:30.

  A. until B. to

  C. by D. within

  参考答案:

  7-8:AC

  二、分析句子的语法结构,并译成中文。