39.If I _________ when the milkman comes,tell him to put the bottles on that shelf.
39.If I _________ when the milkman comes,tell him to put the bottles on that shelf.
A.am shopping B.will be shopping C.have been shopping D.am going shopping
50.If you __________ at the corner when I pass,I’ll give you a lift into town.
A.are standing B.stand C.are going to stand D.have been standing
这两题有什么不同?为什么第一个要用进行时,而后面那题却不用?
都有when啊……
If I am shopping when the milkman comes,tell him to put the bottles on that shelf.
If you stand at the corner when I pass,I’ll give you a lift into town.
两句要考查的是if引导的状语从句.
记住一个固定格式：当主句用一般将来时的话,它的状语从句要用一般现在时,例如第二句.从句中使用的一般现在时来表示将来的时态.
至于第一个句子,它的主句用的是祈使句,所以从句没有可能用将来时,排除B和D,而C表示已经开始并持续到现在的动作,所以也要排除.它的整句的意思是,如果当送牛奶的来的时候我正在购物的话,告诉他瓶子放在架子上.
补充：至于那个when就是修饰if从句的另一个时间状语从句,在两个题目中不用太过在意,只是起到一个修饰的作用,表示,当if那个从句的动作发生的同时,那个when从句的动作也发生了.