正常译法是i don't know what to do ,为什么不能用i don't know how to do

正常译法是i don't know what to do ,为什么不能用i don't know how to do 为什么I don't know what to do成立而I don't know how to do不成立 I don't know what to do i don't know ()to do.填what还是how I don’t know what to do.I don’t know how to do.（ × ） 第二句 how i don"t know what to do (next) 和i don"t know how to do (next I don't know "What to do 和 I don't know "How to do it"?哪个句子是 I don't know what to do.为什么不是I don't know what to be done.请高 I understand,but,I don't know what to do? i don't know how to do next还是what to do next I really don't know -----with it.A .what to do B.how to do 选 i don't know how to do it句型转换