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1、unless,assoonas 和so...that...unless是连词,意为“除非；如果不”,相当于“if...not...”,用来引导条件状语从句。如：Youwon’tcatchthebusunlessyourun.UnlessDadagrees,Ican’tgotothemovies.assoonas是连词,意为“一……就……”,用来引导时间状语从句。如：Mybrotherwilllookforajobassoonasheleavesschool.Youmaydrinkwaterassoonasyoureachhome.注意：通常情况下,在含有
2、unless和assoonas的复合句中,如果主句用一般将来时、主句为祈使句或主句的谓语部分含有情态动词,那么unless和assoonas引导的从句常用一般现在时。so...that... 是连词,意为“如此……以至于……”,用来引导结果状语从句,so修饰形容词或副词。常见结构有“so+形容词 / 副词+that从句”和“so+形容词+a(n)+可数名词的单数形式+that从句”等。如：Themanspokesofastthatwecouldhardlyfollowhim.Andyissohonestamanthatweallbelievehim.1.
3、so...that... 结构常常可与too...to... 结构,...enoughto... 结构进行转换，但是如果that引导的从句中的主语和主句中的主语不同，转化为too...to... 结构或 ...enoughto... 结构时要用for引出不定式的逻辑主语。如：Mycousinissoyoungthathecan’tgotoschool.→Mycousinistooyoungtogotoschool.→Mycousinisnotoldenoughtogotoschool.Shewalkedsoquicklythatwecouldn’tcat
4、chupwithher.→Shewalkedtooquicklyforustocatchupwith.→Shedidn’twalkslowlyenoughforustocatchupwith.2.such...that... 也表示“如此……以至于……”，用来引导结果状语从句，可与so...that... 结构进行转换。常见结构有“such+a(n)+形容词+可数名词的单数形式+that 从句”和“such+形容词+可数名词的复数形式 / 不可数名词+that从句”等。如：ItwassuchaninterestingfilmthatIwenttoseei
5、tseveraltimes.→ ItwassointerestinganfilmthatIwenttoseeitseveraltimes.Theyaresuchcleverboysthateveryonelikesthem.→Theboysaresocleverthateveryonelikesthem.单项选择。1.—Howlongwillyoustayhere?—______Ifinishmyhomework,I’llgobackhome.A.AssoonasB.WhileC.UnlessA2.We’llhaveapicnicneartheriver
6、tomorrow______itrainsheavily.A.until B.if C.unless D.when3.TherearefewerandfewertigersinIndia.Thesituationwillcontinue______humansstophuntingthemfortheirfurandbones.A.if B.unless C.because D.sinceCB4.Ithinkyoushouldcomplain,______,ofcourse,youarehappywitht
7、hesituation.A.unless B.howeverC.until D.thoughA5.—YourgrandfatheroftendoesTaiChiinthepark.—Yeah,______badweatherstopshim.A.when B.sinceC.unless D.becauseC6.Iwillbeveryhappy______youcometomyparty.A.if B.though C.or7.Itis______abeautifulgard
8、en______weliketoplayinit.A.so;that
