how to do it和what to do:为什么how后外面带个it?还有麻烦解释一下不及物动词~how to choose=what to choose吗?为什么how to choose不用加it?

how to do it和what to do it的区别how to do it，what to do 的区别 how to do it和how to do with it I want to learn______ a.what to do with it b.how to do c.what to do it d.to do 写出原因 用what和howI want to learn______ a.what to do with it b.how to do c.what to do it d.to do 写出原因 用what和how分别怎么问 how to do it next还是what to do next 关于how to do it what to do what to do how to do it区别 how to do it what to do的区别 what to do和how to do She feels sad.She doesn't koow ______________.A what to do B how to do it what to do 和how to do it 的语法要点 what to do和how to do it有什么区别? l really don,t know _____ and _____.A.What to do,How to do B.what to do it ,how to do itC.what to do it ,How to do D.What wo do,how to do it the teacher told us___and___A.What to do,how to do B.what do,how do it C.what to do,how to do it D.what to do it,how to do it how to do,how to do it,what to do 有何区别? how to do it? how to do it和what to do:为什么how后外面带个it?还有麻烦解释一下不及物动词~how to choose=what to choose吗?为什么how to choose不用加it? what to do,what should i do区别what to do = how to do it?以及how to do it,how should i do it；what to do,what should i do的区别 how to do和what to do的区别 what to do和how to do it为什么前者不能加it而后者必须加?