do 1. do通常用来协助主动词表示否定意义或构成疑问句
My wife doesn’t know Russian
Do you agree with me?
2.do用来加强语气,起强调作用 You do look well
3.do用作代词 ---Do you like Beijing? ---Yes,I do (do代替like Beijing)
Examples: 1. It may snow before nightfall.
2. Would you let me use your pen for a minute?
3.If she became a movie star, she could afford a new home.
注意:情态动词过去时形式并不一定就表示过去时间 情态动词不能叠加使用,其后接的是动词原形
第10讲
动词和动词词组
动词分类(一)
1,按其在动词词组中所起的作用分:主动词和助动词
{主动词: 又叫实义动词,能独立作句子谓语成分 简单动词词组 复杂动词词组 基本助动词:be,do,have
{ 助动词
情态助动词 can,could,may,might,will,would,shall,should,need, must,dare,dared,ought to,used to
半助动词:have to,seem to,be about to,be due to, be going to ,be meant to,be meant to,be supposed to等.
Examples: 1.The workers received a raise last year.
2.They have been taking music lessons.