当if 等于whether 时引导的从句用什么时态.如I don't know if she()(come)用现在时还是将来时啊

I don't know if she will come. if、whether二者都可用来引导间接引语中的一般疑问句i或选择疑问句.引导宾语从句表示“是否”时, 两者常可互换.例如: He asked whether/if Ⅰ would attend the metting. 他问我是否...