1、单元语法小专题(Grammar Focus)语法精讲be supposed to 的用法1be supposed to 意为“应该、理应、被期望” ，多用来表示劝告、建议、义务、责任等，相当于should。 be supposed to 的时态 、人称和数等的变化都在be 动词上体现 ，其中的 to 是动词不定式符号，后面接动词原形。如：Parents are supposed to ask their children to know some good manners.父母应该让孩子们知道一些好的礼仪。Youre supposed to start work at 8：30 every m
2、orning. 你应该每天早晨 8 点半开始工作。2be supposed to 的否定形式是 be not supposed to，相当于 should not 或 be not allowed to，意为“不应该，不准、不得” 。如：We are not supposed to play football in the street.我们不应该在街上踢足球。3be supposed to 的一般疑问句是将 be 的相应形式置于主语前，特殊疑问句是在一般疑问句前加上相应的疑问词。如：来源:学优高考网Is she supposed to arrive at the train station
3、at three oclock in the afternoon? 她应该在下午三点钟到火车站吗？4be supposed to have done sth.表示“本应该做某事但没做” 。如：Hes supposed to have finished the work so far.到目前为止，他本应该完成这项工作。Youre supposed to have handed in your homework.你本该把作业交上来了。5如果表达“过去某时应该(不应该) 做”时，用 was(wasnt)/were(werent)supposed to，相当于should(shouldnt) have
4、动词的过去分词。如：来源:学优高考网I was supposed to finish the task at 4：30，but I finished it at 5：00.我应该在四点半完成任务，却在五点钟才完成。【拓展】(1)suppose 作动词有 “猜想”的意思，suppose sb.to do sth.意为“猜想某人去做某事 ”。如：I supposed him to stay at home.我猜他待在家里。(2)suppose 后面也可接 that 从句。当主句的主语是第一人称 I 或 we，且主句谓语是一般现在时态时，从句的否定要转移到主句上。如：I dont suppose t
5、hey will say sorry to her.我猜想他们不会对她说对不起。(3)suppose 可用于简略答语中，用 so 代替一个肯定的宾语从句；用 not 代替一个否定的宾语从句 。如：Do you suppose hell fail to catch the train? 你认为他会错过火车吗？I suppose so./I suppose not.(I dont suppose so.)我想会的。/我想不会 。语法精练.用 suppose 的适当形式填空。1I suppose she is not yet thirty years old.2You were supposed t
6、o be here at 2：00.I have been waiting for you for almost an hour!3I suppose that my father will be back in half an hour.4You are not supposed to trouble her again.5Is it going to rain this afternoon?来源:学优高考网Yes， I suppose so.按要求完成下列句子，每空一词。6She should arrive here at 7：00.( 改为同义句)She is supposed to a
7、rrive here at 7：00.7You are supposed to help him out.(改为否定句)You are not supposed to help him out.8I suppose he will be back in an hour.(改为否定句)I dont suppose he will be back in an hour.9Students are supposed to greet_the_teacher when classes begin in China.(对画线部分提问 )What are students supposed to do w
8、hen classes begin in China?10They are supposed to invite Mike to the birthday party next_Sunday(对画线部分提问)When are they supposed to invite Mike to the birthday party?.根据汉语意思完成句子，每空一词。来源:gkstk.Com11你不应该在这里打电话。You are not supposed to make a call here.12在中国，人们第一次见面时应该握手。In China，people are supposed to shake hands when they meet for the first time.13天将下雨了。我看不见得。It will be rainy.I suppose not14他应该一个小时前就到那了。来源:学优高考网 gkstkHe is supposed to have got there an hour ago.15人们不可以在这儿抽烟。People are not supposed to smoke here.
