一、不定式和动名词: 1、省略了 to 的不定式:(助动词后面加动词原形) have sb. do sth. let sb.do sth. make sb. do sth. help sb. do sth./help sb. with sth. can/may/have to/must do sth. see sb do sth(看见某人做某事,看见全过程,类似的还有:hear sb do sth , watch sb.do sth , find sb. do sth., notice sb. do sth 等) 2、带 to 的不定式: want to do sth. want sb. to do sth. ask sb. to do sth. decide to do sth would like to do sth. hope to do sth. like to do sth(一般指一次性的行为) love to do sth. remember to do sth(记得去做某事,此事还未做) stop to do sth(停下来去做某事,此事是即将要做的事) 3、带 to 的不定式可以作后置定语,如:something to eat(吃的东西) 4、不定式表目的:如 To save class time, our teacher has us do half of the exercises in class and complete the other half for our homework. 为了节约课堂时间,我们的老师要求我们在课堂上做一半练习,剩下的一半在课后作为家庭作业完成。 注意:for 也可表目的,但 for 后面加名词或动名词,如 I buy it for you. 5、动名词:(介词后面加名词或动名词) have fun doing sth. practice doing sth. enjoy doing sth. what/how about doing sth. be busy doing sth. spend time doing sth. be good at doing sth.(be good at sth.) like doing sth(经常性的行为,习惯爱好) remember doing sth(记得做过某事,此事已经做了) stop doing sth(停止做某事,此事是要停止的) see sb doing sth(看见某人正在做某事,类似的有:hear sb doing sth , watch sb.doing sth , find sb. doing sth., notice sb. doing sth) No talking(与之类似的:No swimming , No smoking 等) thanks for doing sth. 二、冠词 不定冠词:a , an 可数名词前可以加 a 或 an。以元音(不是元音字母)开头的名词前加 an,以辅音开头的名词前加 a 如:a uniform an hour There is a “u” and an “n” in the word. 定冠词:the,有指定性的名词前加 the,前文出现过再次出现时前面也加 the 注意:物...