什麼是助动词?English.

最常用的助动词有：be,have,do,shall,will,should,would 他们表示时态,语态,构成疑问句与否定副词not合用,加强语气半助动词.基本助动词 基本助动词只有三个：be,do,have,他们没有词汇意义,只有语法作用,如协助构成进行体,完成体,被动态,否定句,疑问句等.例如 He is giving a lecture.他在作报告He has made a plan.他已经订了计划The small animals are kept in the cages.小动物都关在笼子里.助动词协助主要动词完成以下功用a.表示时态,例如：He is singing.他在唱歌.He has got married.他已结婚.b.表示语态,例如：He was sent to England.他被派往英国.c.构成疑问句,例如：Do you like college life?你喜欢大学生活吗?Did you study English before you came here?你来这儿之前学过英语吗?d.与否定副词not合用,构成否定句,例如：I don't like him.我不喜欢他.e.加强语气,例如：Do come to the party tomorrow evening.明天晚上一定来参加晚会.He did know that.他的确知道那件事.3） 最常用的助动词有：be,have,do,shall,will,should,would,did.