If he_____free,he'll call me.A.does't B.isn't C.won't D.don't为什么用Isn't而不用Won't
问题描述：
If he_____free,he'll call me.
A.does't B.isn't C.won't D.don't
为什么用Isn't而不用Won't
答
一定是用isn't，这样它的意思就是"如果他没有空",
如果你用won't，意思就是"如果他(不能)有空"..不对吧~~
所以用isn't咯~~
^^
答
这是条件状语从句,时态要求:当主句是一般将来时或祈使句,从句要用一般现在时
例子:I don't know if he will come to the party, if he comes, I will let you know.第一个if引导宾语从句,表示"是否",用将来时,第二个if引导条件状语从句,表示"如果",用一般现在时.
答
b
if 条件句中,if中用一般现在时,主句用一般将来时.所以用Isn't而不用Won't
答
选b