I don`t understand all that what he said mean.为什么能这么说1） I don`t understand all that what he said mean.2） I don`t understand all what he said mean.3） I don`t understand what what he said mean.我只觉得第三个对

I don`t understand all that what he said mean.为什么能这么说1） I don`t understand all that what he said mean.2） I don`t understand all what he said mean.3） I don`t understand what what he said mean.我只觉得第三个对
I don`t understand all that what he said mean.为什么能这么说
1） I don`t understand all that what he said mean.
2） I don`t understand all what he said mean.
3） I don`t understand what what he said mean.
我只觉得第三个对

I don`t understand all that what he said mean.为什么能这么说1） I don`t understand all that what he said mean.2） I don`t understand all what he said mean.3） I don`t understand what what he said mean.我只觉得第三个对
三个句子都为宾语从句.但mean 是及物的,也要跟宾语.
首先说第三个吧understand 后面的是understand的宾语.第一个what 做mean的宾语,正确.
1）和2）是一样的,宾语从句的that 可以省略.all是mean 的宾语.正确

此句是宾语从句

仅仅第2个对。