什么是be,和do,祈使句,请讲明白

什么是be,和do,祈使句,请讲明白

be助词 v.aux. 1.(与动词的现在分词连用,构成各种进行时态)正在...,在...I won't be free this afternoon. I'll be seeing a friend off. 我今天下午没空,我要给朋友送行. What were you doing from 9 to 11 this morning? 今天上午九点到十一点你在做什么? He is working. 他在工作. 2.(与及物动词的过去分词连用,构成被动语态)被...The problem was solved long ago. 问题早解决了. It will be discussed tomorrow. 此事将在明天讨论. 3.【旧】(与不及物动词go,come,rise等的过去分词连用,构成完成时)已经...The sun is set. 太阳已经下山. 4.(与动词不定式连用,表示职责、义务、意图、约定、可能性等)应该做...,必须做 ...;预定做...;会做...The President is to visit Japan next week. 总统将于下周访问日本. You're to do your homework before you watch TV. 你应该做了功课再看电视. 不及物动词 vi. 1.是[L]At that time he was the chair of the department. 当时他是系主任. I am a teacher and they are my students. 我是老师,他们是我的学生. She is very young. 她非常年轻. 2.(表示时间、度、量、价值等)是;值;等于[L]The watch is 100 dollars. 这表值一百元. 3.(常用祈使语气或不定式)要,得;成为;变成[L]Be quiet, please. 请安静. 4.(与there连用)有[L]There are a lot of tourists there. 那里有许多观光客. 5.逗留,(继续)呆[L]He will be here all next week. 下周他将一直呆在这儿. 6.在[Q]Tony is in the office. 托尼在办公室里. 7.存在Whatever is has every reason for being. 存在的东西总有其存在的理由. 8.听任If she's sleeping, let her be. 如果她在睡觉,就别惊动她.一、祈使句的分类祈使句表请求、命令、叮嘱、邀请、劝告等.祈使句分为第二人称祈使句及第—、三人称祈使句两大类.1．第二人称祈使句通常用来向听话者发出命令,提出要求或建议.这种祈使句的主语you通常不表示出来,而是以动词原形开头.如：Stand up!Don’t worry about!但如果说话时有多人在场,就得把主语表示出来,或加呼语,以便指明是向谁提出请求或发出命令.如：Parents with children go the front! 带孩子的家长到前面去!Mary clean the

和我的回答一样，看来我也对了