how to do,what to do,what i can do的用法

how to do,what to do,what i can do的用法 How to do What to do.的用法 to do what i can do What to do用法 I really do not know A what to do B how to do c how can i do WHAT TO DO=HOW TO DO How to do 还是 What to do? what to do和how to do what to do 与how to do i what to do I can also think about what to do or how to do things at sch what can i do to fight pollution