零条件句ZeroConditional

　　意义：用于阐述事实.

　　结构：If+subject+simplepresent,subject+simplepresent.

　　Subject+simplepresentif+subject+simplepresent.

　　例句：IfIseeaspider,Igetpanicky.

　　IfeelclaustrophobicandimmediatelywanttogetoutofifIenteranenclosedspace.

　　第一条件句FirstConditional

　　意义：表达一个动作后的结果

　　结构：If+subject+simplepresent,subject+will+verb.

　　Subject+will+verb+if+subject+simple+present.

　　例句：Ifwemovetheofficetothe15thfloor,I'llresign.

　　I'llprobablyhaveanotherpanicattackifIseeaspider.

　　第二条件句SecondConditional

　　意义：用于表达一个假设情况后的结果.

　　结构：If+subject+simplepast,subject+would+verb.

　　Subject+would+verb+if+subject+simplepast.

　　例句：IfIdidn'tsufferfromafearofflying,Iwouldtravelmore.

　　IwouldconsultadoctorifIhadaphobia.

　　第三条件句ThirdConditional

　　意义：是用来表达如果(If)当时那样发生,另外一方面（当时）会如何（通常是指过去的事情,带有一切已经太迟而不能够补救的意思）.

　　结构：If+subject+pastperfect,subject+wouldhave+pastperfect.

　　例句：Shewasill.Shedidn’tgotowork.

　　改成第三条件句：Ifshehadn'tbeenill,shewouldhavegonetowork.