用if造几个简单的句子

例句：I didn't know if he would come. 　　=I didn't know if he was going to come. 　　我不知道他是否会来. 　　She was sixty-six. In three years,she would be sixty-nine. 　　她66岁了.三年后,她是69岁. 　　She told us that she would not go with us,if it rained. 　　她告诉我们,如果下雨,她就不和我们一起去了. 　　I didn't know how to do it. What would be their ideas? 　　我不知如何去做,他们会有什么想法呢? 　　2.过去将来时常可用来表示过去习惯性的动作.此时,不管什么人称,一律用would. 　　This door wouldn't open. . 　　这扇门老是打不开. 　　Whenever he had time,he would do some reading. 　　他一有时间,总是看书. 　　I would play with him when I was a child. 　　当我还是孩童时,总是和他一起玩.如: 　　You know I would come. 你知道我会来的. 　　We never imagined that John would become a doctor. 我们从未想过约翰会成为一个医生. 　　过去将来时有时可带时间状语.如: 　　He said he would come back the next day. 他说他第二天回来