Unit 6 单元语法小专题(Grammar Focus)-2018年八年级下册英语名师学案（人教版）

单元语法小专题(Grammar Focus) 语法精讲 unless，as soon as，so…that…引导的状语从句 1．unless引导的条件状语从句[来源:Z+xx+k.Com] unless是从属连词，意为“如果不；除非”，引导条件状语从句。如果主句的时态是一般将来时，unless引导的条件状语从句通常用一般现在时代替一般将来时。另外，unless引导的条件状语从句表示否定意义，相当于if条件状语从句的否定形式(if…not)。 e．g.They will go on a picnic tomorrow unless it rains.＝If it doesn't rain，they will go on a picnic tomorrow.如果不下雨，他们明天就去野餐。 2．as soon as引导的时间状语从句 as soon as意为“一……就……”，引导时间状语从句，表示主从句的动作是紧接着发生的。as soon as引导的时间状语从句在过去时态中主从句时态一致；若主句用一般将来时，则从句用一般现在时。 e．g.As soon as we got home，it began to rain.我们一到家，就开始下雨了。 3．so…that…引导的结果状语从句 so…that…意为“如此……以至于……”，引导结果状语从句。常见于以下四种结构： (1)so＋形容词/副词＋that从句。 e．g.Kate was so busy that she forgot to have breakfast.凯特忙得忘记吃早饭了。 (2)so＋形容词＋a/an＋单数名词＋that从句。 e．g.It is so interesting a book that I want to read it again.这本书如此有趣，我还想读一遍。 (3)so＋many/few＋复数名词＋that从句。 e．g.He has so few friends that he often feels lonely.他朋友很少，所以他经常感到孤独。 (4)so＋much/little＋不可数名词＋that从句。 e．g.There was so little water in the jar that it was not enough for all of us.缸里的水太少了，不够我们这些人用的。 【拓展】such…that…意为“如此……以至于……”，也可引导结果状语从句，但such修饰的是名词。 e．g.They are such good students that the teacher likes them.他们都是很好的学生，老师喜欢他们。语法专练 　　　　　　　　　　　　　　　　　　　 一、从方框中选出合适的单词或短语填空。 [来源:Zxxk.Com] 1．He didn't go to bed __until__ his mother came back.[来源:学科网ZXXK] 2．__As_soon_as__ he saw her，he fell in love with her.[来源:Z。xx。k.Com] 3．She is __so__ beautiful that everyone likes her. 4．My daughter won't eat dumplings __unless__ she is very hungry. 5．It is __such__ important news that everyone listens to the radio carefully. 二、单项选择。 (B)6.It is ________ a beautiful garden ________ we like to play in it. A．so；that B．such；that C．too；to D．very；that (D)7.(2018·毕节模拟)I'll go to visit my aunt in England ________ the summer holidays start. A．while B．since C．until D．as soon as (C)8.Tom is ________ nervous ________ he can't talk in front of all the classmates. A．such；that B．too；to C．so；that D．enough；that (C)9.(2018·黔东南模拟)—May I go to the science museum with you next Saturday? —You can't _____