if it___tomorrow,we'll go swimming.选择A.isn't rain B.doesn't rain.为什麽答案是B 而不是A?
不是都是助动词吗?
如果是Charlie____ here next month?A.isn‘t coming B.doesn’t come 选什麽呢?
人气:403 ℃ 时间:2019-11-04 09:14:55
解答
if it___tomorrow,we'll go swimming.
选B
这是if引导的条件状语从句,主将从现
所以从句【if it doesn't rain_tomorrow】用的就是一般现在时
这是固定用法
Charlie isn't coming here next month?
这边因为后面有【next month】所以表示将来
这边是用进行时表示将来,所以用【isn't coming】可tomorrow,不也是一般將來時的時狀嗎?不是说了吗~这是if引导的条件状语从句,主句必须用将来时,从句必须用一般现在时,不看时间状语的
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