if
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2023年4月7日发(作者：下载快玩)if的用法总结
if的用法总结：
if表示条件，意思是如果；if表示虚拟，意思是假如；if表示是否
的含义，和whether相同用法，连接宾语从句。
扩展资料
1.(表示条件)如果,主句用将来时,if从句用现在时表示将来
Hewillcomeifyouinvitehim.
如果你请他,他会来的.
2.(表示虚拟)假如,要是
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.
Thericewouldnothavebeenburntifyouhadbeenmore
careful.
IfmylawyerhadbeenherelastSaturday,hewouldhave
preventedmefromgoing.
Ifhehadcomeyesterday,Ishould/wouldhavetoldhim
aboutit.
含义：Hedidnotcomeyesterday,soIdidnottellhimabout
it.
Ifhehadnotbeenillandmissedmanyclasses,hewouldhave
madegreaterprogress.
含义：Hewasillandmissedmanylessons,sohedidnotmake
greaterprogress.
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.
3.是否=whether连接宾语从句
Iwonderifsheisill.
不知她是否病了.
if