There are no shortcuts to learning a foreign language.不明白to后边为什么加doing.怎么区分to是介词还是to do不定式

there are no shortcuts there are no There are no accidents. there are no files There are no accidents There are no accidents There are no people here. there are no accidents 歌词 there are no trees还是no tree are tall no there buildings there造句 There is no people here还是There are no people there is no 与 there are no 的区别 there are no friends还是there is no friends there are no animals还是there is no animals? 是 There are no things .还是 There is no things . there are no 与there are not的区别 是There is no book还是There is no books?或There are no books There are no books on the shelf.