1. be+to do表示“将要做……”

　　He is very happy to be a student in the university. 将要成为大学生，他感到非常高兴。

　　2. have (has) + to do表示“不得不做……”

　　It is late now. He has to go home. 天晚了，他不得不回家去。

　　I have to stop my car and wait for the policeman. 我不得不停车等那个警察。

　　3. there be ... + to do表示“有……要做”

　　There is nothing important to do today. 今天没有什么重要的事要做。

　　There are lots of letters to post now. 现在有许多信要寄。

　　4. be about+to do表示“正要做……”

　　She was just about to leave when someone called her. 正要离开，忽然有人给她打电话。

　　Hurry up!The match is about to begin. 快点，比赛就要开始了。

　　5. only+to do表示“却……”

　　She went home in a hurry only to find that nothing happened there. 她匆忙回家，却发现那儿什么事都没有发生。

　　He lifted a stone only to drop it on his own feet. 他搬起了石头却砸了自己的脚。

　　6. so as(not)+to do表示“为了(不)……”

　　She worked hard so as to be a college student. 为了上大学，她努力学习。

　　He went to work early so as not to be late. 为了不迟到，他很早就去上班了。

　　7. enough+to do表示“十分……，足够……”

　　The girl isn't old enough to go to school. 这个女孩还不到上学的年龄。

　　8. It is (was)+形容词 + of(for)sb. + to do ... 表示“(某人)做某事很……”。

　　It is wise of you to do so. 你这样做很明智。

　　It's very hard for you to get there on foot. 对你来说，步行到那儿是非常艰难的。

　　(文/丁德田；英语辅导报初三版04—05学年度第8期；版权归英语辅导报社所有，独家网络合作伙伴新浪教育，未经许可，不得以任何形式进行转载。)