条件状语从句常用引导词：if,unless,特殊引导词：as/so long as,only if,providing/provided that,suppose that,in case that,on condition that We’ll start our project if the president agrees.You will certainly succeed so long as you keep on trying.Provided that there is no opposition,we shall hold the meeting here.让步状语从句常用引导词：though,although,even if,even though 特殊引导词：as(用在让步状语从句中必须要倒装),while ( 一般用在句首 ),no matter …,in spite of the fact that,while,whatever,whoever,wherever,whenever,however,whichever Much as I respect him,I can’t agree to his proposal.尽管我很尊敬他,我却不同意他的建议.The old man always enjoys swimming even though the weather is rough.No matter how hard he tried,she could not change her mind.He won’t listen whatever you may say.