I don't know ----- there is any danger in this type of plane.填if 还是that.

问题描述:

I don't know ----- there is any danger in this type of plane.填if 还是that.
我明天就要考试,还有能讲一下I don 't know 后跟that 和if的区别吗,我们老师讲的云里雾里的

if那这句话是什么意思,不能用that吗不能,如果用that 的话就要吧标点符号改一下了能说清楚一点吗i dont know if there is any danger in this type of plane, 我不知道这种飞机有任何危险。 i dont know that there is any danger in this type of plane! 可我以前不知道这些飞机存在危险! 而且如果要用that的话也要把is改成was