英文版现在进行时用法详解.ppt
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1、Simple Present Tense现 在 进 行 时,How do we make simple present tense(构成),subject+auxiliary verb+main verb主语+情态动词+主动词 do baseFor positive sentences,we do not normally use the auxiliary.For the 3rd person singular(he,she,it),we add s to the main verb or es to the auxiliary.(does)If the verb ends in-ss,-s
2、h,-ch,-x or-o,add-es to the base form:kiss-kisses,finish-finishes,watch-watches,mix-mixes,go goes If the verb ends in consonant+y change y to i and add-es:study-studies,copy-copies,try-tries,carry-carries For the verb to be,we do not use an auxiliary,even for questions and negatives.(see table 2)Aux
3、iliary verbs do,have,which can also be used as main verbs,to do to haveI/you/we/they do I/you/we/they havehe/she/it does he/she/it has,Look at these examples with the main verb like:,Look at these examples with the main verb be.Notice that there is no auxiliary:,When do we use simple present tense(何
4、时使用),Facts,generalizations and universal truths(事实,结论,普遍真理)Habits and routines(习惯和日常活动)Permanent situations(不变的情况)Events that are certain to happen(一定要发生的事件)Arrangements that we cant change(e.g.timetables,official meetings)(不能改变的安排)State verbs(e.g.be,have,suppose,know)(静态动词)Narrations,instructions o
5、r commentaries(叙述,说明或评论解说),Use 1:Facts,Generalizations and Univeral TruthsWe use the Present Simple to talk about universal truths(for example,laws of nature)or things we believe are,or are not,true.Its also used to generalize about something or somebody.Water boils at 100 degrees Celcius.Universal
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