大学英语四级语法知识：非真实条件句思维导图
大学英语四级语法知识：非真实条件句
树图思维导图提供 大学英语四级语法知识：非真实条件句 在线思维导图免费制作，点击“编辑”按钮，可对 大学英语四级语法知识：非真实条件句 进行在线思维导图编辑，本思维导图属于思维导图模板主题，文件编号是：c0e56be8eb8d8a2d2327bec513b4e320
思维导图大纲
大学英语四级语法知识：非真实条件句思维导图模板大纲
非真实条件句
时态：可以表示过去，现在和将来的情况。它的基本特点是时态退后。
a.同现在事实相反的假设。
句型：条件从句主句
一般过去时should(would)+动词原形
Iftheywerehere,theywouldhelpyou.
b.表示于过去事实相反的假设。
句型：条件从句主句
过去完成时should(would)have+过去分词
Ifshehadworkedharder,shewouldhavesucceeded.
Thericewouldnothavebeenburntifyouhadbeenmorecareful.
IfmylawyerhadbeenherelastSaturday,hewouldhavepreventedmefromgoing.
Ifhehadcomeyesterday,Ishould/wouldhavetoldhimaboutit.
含义：Hedidnotcomeyesterday,soIdidnottellhimaboutit.
Ifhehadnotbeenillandmissedmanyclasses,hewouldhavemadegreaterprogress.
含义：Hewasillandmissedmanylessons,sohedidnotmakegreaterprogress.
c.表示对将来的假想
句型：条件从句主句
一般过去时should+动词原形
were+不定式would+动词原形
should+动词原形
Ifyousucceeded,everythingwouldbeallright.
Ifyoushouldsucceed,everythingwouldbeallright.
Ifyouweretosucceed,everythingwouldbeallright.
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