Unit4-Unit4-连词连词unless-as-unless-as-soon-assoon-as和和so.-.-.-thatso.-.-.-that【知【知识构建】构建】(一一)定定义状状语从从句句由由从从属属连词引引导, 从从属属连词不不充充当当句句子子成成分分, 只只起起连接接作作用用。状状语从从句句在在复复合合句句中中修修饰主主句句中中的的谓语、形形容容词或或副副词, 根根据据意意义上上的的不不同同, 可可分分为: 条条件件状状语从从句句、时间状状语从从句、句、结果状果状语从句等。从句等。类型型引引导词例句例句条件条件状状语从句从句if, unlessYou wont go to the party unless you have an invitation.除非你有除非你有请柬柬, 否否则你将无法参加聚会。你将无法参加聚会。时间状状语从句从句as soon as,when, while,after, untilI will call you up as soon as I get home.我一到家就我一到家就给你打你打电话。He was reading a book when the rainstorm came. 当暴当暴风雨来的雨来的时候候, 他正他正在在读书。结果果状状语从句从句so. . . that,such. . . thatHe is so tired that he cant eat any food.他累得吃不他累得吃不进饭去。去。She is such a kind person that she always helps others.她是个好人她是个好人, 总是帮助是帮助别人。人。(二二)状状语从句的注意事从句的注意事项1. 在在条条件件状状语从从句句和和时间状状语从从句句中中, 通通常常用用一一般般现在在时表示一般将来表示一般将来时。Unless we talk to someone, we will certainly feel worse. 除非我除非我们找人聊聊找人聊聊, 不然我不然我们肯定会感肯定会感觉更糟。更糟。2. 当当主主句句的的主主语与与从从句句的的主主语一一致致, 且且从从句句为肯肯定定句句时, so. . . that. . . 可以与可以与. . . enough to结构相互构相互转换。He is so old that he can look after himself. =He is old enough to look after himself. 他足他足够大了能照大了能照顾自己。自己。3. 当当结结果果状状语语从从句句表表达达否否定定意意义义时时, 可可与与too. . . to. . . 结结构构相互转换。相互转换。He is so young that he cant look after himself. =He is too young to look after himself. 他如此小以至于不能照顾自己。他如此小以至于不能照顾自己。