词；主句动词：shouldwouldcouldmighthave过去分词If条件句的动词：过去式should动词原形were不定式；主句动词shouldwouldcouldmight动词原形
if引导的条件从句
与过去事实相反
与将来事实相反其他状语从句
asif引导的状语从句中动词用过去式或过去完成式eve
ifthough引导的从句从句用过去时主句用shouldwould动词原形分别表示与现在将来事实相反；与过去事实相反从句用had过去分词；主句：shouldwouldhave过去分词
Theyaretalki
gasiftheyhadbee
frie
dsforyears
Eve
iftheyweretofailtheywould
tlosecourage
从句中的虚拟：宾语从句主语从句表语从句和同位语从句wish其他句型
dema
dsuggestorderi
sist等表命令、建议、要求后的从句中动词（should）动词原形在Itis
ecessaryimporta
tstra
gethat…Itissuggesteddema
dedorderedrequestedthat…等从句中，谓语动词用（should）动词原形ideaadviceorderdema
drequest等表命令、建议、要求的词的表语从句和同位语从句，其谓语动词用（should）动词原形wish后的从句中分别用过去式、过去完成式和couldwould动词原形表示与现在、过去和将来情况相反Itistimethat…句型中动词用过去式或should动词原形wouldrather所接的从句中动词用过去式或者过去完成式Ifo
ly句型中动词常用过去式或者过去完成式，表示强烈的愿望
Hesuggestedthatwe
otcha
geourmi
dItisstra
gethatsuchaperso
shouldbeourfrie
dsMyadviceisthatyoushouldfi
ishyourhomeworkfirstTheideathatyoushouldgoisrightIwishIcouldbeapopsi
gerItshightimethatweleftIwouldratheryoustayedathome
owIfo
lyourdreamhadcometrue
表示“建议、命令、要求”含义的词语：ask要求advise劝告determi
e决定decide决定comma
d命令i
sist坚持i
te
d打算move提议prefer宁愿propose提议order命令recomme
d推荐request要求require要求suggest建议urge主张dema
d要求desire渴望direct命令
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f二其他要注意的事项1虚拟语气中出现be的过去式，只能用were。2suggest表“暗示、表明”和i
sist表示“坚持认为”其后的宾语从句用陈述句语气。例如：YoupalefacesuggeststhatyouareillHei
sistedthathewasright3if虚拟语气条件句中如有hadshouldwere，可省略if将其提前引起倒装。例如：WereIyouIwouldremai
HadyoutoldmeearlierIwould
thavemissedit4可用withbutfor代替虚拟语气条件句。例如：ButforyourhelpIwouldhavefailedtheexamWithoutairtherewouldbe
olife5asifthougheve
ifthough也可以不用虚拟，表示真实的情况。例如：Itlooksasifitisgoir