英語(yǔ)語(yǔ)法大全之條件狀語(yǔ)從句
	 
	  條件狀語(yǔ)從句
	    
	  連接詞主要有 if, unless, as/so long as, on condition that 等。.
	  if 引導(dǎo)的條件句有真實(shí)條件句和非真實(shí)條件句兩種。非真實(shí)條件句已在虛擬語(yǔ)氣中闡述。
	 
	  unless = if not. 
	  Let's go out for a walk unless you are too tired.
	  If you are not too tied, let's go out for a walk.
	 
	  典型例題
	  You will be late ___ you leave immediately. 
	  A. unless  B. until  C. if  D. or
	  答案A。 句意:除非你立即走,否則你就回遲到的。可轉(zhuǎn)化為 If you dong leave immediately, you will be late. B、D句意不對(duì),or表轉(zhuǎn)折,句子如為 You leave immediately or you will be late.  
	 
		   
                          
           
           
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