请教我,.

很简单啊！~

后面是一个特殊 疑问句：疑问词是HOW LONG！~所以就应该把它作为引导词

而用IF作引导词的要是引号里面是个一般疑问句

比如说TOM ASKED LUCY“DO YOU LOVE DOGS”

这句话才变成TOM ASKED LUCY IF SHE LOVED DOGS

2,I asked Sandy if she will stay here

这句话错在时态。主句用的过往 时态，所以从句不能用现在时态。应该改为：

I asked Sandy if she would stay here.