在4种名词性从句里,if只能引导宾语从句,不能引导主语从句补语从句和同位语从句。as if可以引导补语从句。在主语从句里,是。。。还是。。。用whether来引导。
whether he is nice or not remains to be seen.
it's uncertain whether he will come here or not.
whether we are going to visit the Great wall or not hasn't been decided.
追问不是吧。可以的吧。只是if引导的主语从句不能居于复合句句首。是么?老师
追答再重复一遍:if不能引导主语从句。只能引导名词性宾语从句。