What worries us most is if he can come back in time for his son's wedding.修改病句,有一处错误.
问题描述：
What worries us most is if he can come back in time for his son's wedding.修改病句,有一处错误.
答
if 改为whether
因为he can come back in time for his son's wedding是一个表语从句,if不能引导表语从句.
加油!