How long does it take the trees to change into coal?主语是什么?trees后的to该有吗?

How long does it last? how long does it take you? How long does it take by t()? How long long does it take you to get there what does a beetle eat?how long does it live? How long does it take中it代表什么 how long dose it和how long does it的区别说错了 how long dose it和how long is it的区别 How long does it take you go to school? How long does it take____【go】 to Shanghai by train how long does it take?中的take是什么意思 how long does it take.造五句并解 how long does it take.造五句并答 How long does it take him_(walk)there How long does it ____(walk) to the train station how long does it take her to walk there how long does it take you ( )(get)there 连词成句 how , long ,take , does ,it ,you , there(?) How long does it take to go there by