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til①肯定句：主句谓语动词必须是延续性动词，主从句都为肯定式，意为“某动作一直肯定句：主句谓语动词必须是延续性动词，主从句都为肯定式，意为“延续到某时间点才停止”延续到某时间点才停止”他一直留在那里直到她回来。________________________________________________否定句：主句谓语动词必须是非延续性动词，从句为肯定式，意为“②否定句：主句谓语动词必须是非延续性动词，从句为肯定式，意为“某动作直到某时间才开始”时间才开始”直到她回来他才去睡觉。____________________________________________________不可置于句首，可以。③______不可置于句首，而_______可以。不可置于句首可以④
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til句型中的强调和倒装用法。句型中的强调和倒装用法。直到你告诉我，我才知道这件事。正常句式：_______________________________________________________________
f倒装句式：_______________________________________________________________强调句式：_______________________________________________________________Exercises直到他回来，我才走。正常句式：_______________________________________________________________倒装句式：_______________________________________________________________强调句式：_______________________________________________________________3before①含义Wehadsailedfourdaysa
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amilebeforehefelttiredPleasewriteitdow
beforeyouforgetitBeforeIcouldgeti
awordhehadmeasuredme从中谓语不用否定式。②before从中谓语不用否定式。③itwillbe一段时间before_______ItwillbehalfayearbeforeIcomebackItwo
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ce从句一般为非延续性动词，主句为延续性或反复发生的动作。从句一般为非延续性动词，主句为延续性或反复发生的动作。Ihavewritte
homefourtimessi
ceIcamehereShehasbee
worki
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cesheleftschool②itisthreeyearssi
cethewarbrokeoutItisthreeyearssi
ceIsmokedacigar5everytimeeachtime
exttimethefirsttimea
ytime等名词短语用来引导时间姿事从句表示每当；每次；下次等。态事从句表示每当；每次；下次等。EachtimeIwasi
troublehewouldcometohelpmeoutNexttimeyoucomedoremembertobri
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hereExercises
f用whe
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til填空①Fewpeoplewillpayfullatte
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curabledisease②Letmetakedow
whatyouhavesaid_______Iforget③Itmaytakete
yearsormore________thescie
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dacureforAIDS④Itisseveralweeks_______myfathergotdru
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