小学英语四种时态知识点加练习一、一般现在时一.意义：表示经常发生的事情，动作或存在的状态二.构成及变化1.be动词的变化。肯定句：主语+be(am,is,are)+其它。如：Iamaboy.我是一个男孩。否定句：主语+be+not+其它。如：Heisnotaworker.他不是工人。一般疑问句：Be+主语+其它。如：-Areyouastudent?-Yes.Iam./No,I'mnot.特殊疑问句：疑问词+一般疑问句。如：Whereismybike?2.行为动词的变化。l、当主语为第一，二人称及复数时，助动词为do肯定句：主语+动词原形(+其它)。如：Weoftenplaybasketballafterschool.否定句：主语+don't+动词原形(+其它)。如：wedon’tplaybasketballafterschool.一般疑问句：Do+主语+动词原形+其它?如：Doyouoftenplaybasketballafterschool?Yes,wedo./No,wedon't.特殊疑问句：疑问词+以do开头的一般疑问句？如：Whatdoyouoftendoafterschool?２、当主语为第三人称单数时,助动词为does肯定句：主语+动词三单式(+其它)。如：Heswimswell.否定句：主语+doesn’t+动词原形(+其它)。如：Hedoesn’tswimwell..一般疑问句：Does+主语+动词原形+其它。如：Doesheswimwell?Yes,hedoes./No,hedoesn't.特殊疑问句：疑问词+以does开头的一般疑问句？如：Howdoesyourfathergotowork?三．第三人称单数的动词变化规则（只有在第三人称为主语的肯定句中，动词才用三单式）(1)多数动词直接加s:runsgetslikescolletstakesplaysclimbs…….(2)结尾是s,x,sh,ch,o,前为辅音字母,结尾加es:watchesteachesgoesdoeswashescrossesmixesbrushes(3)动词末尾y前为辅音:将y改为i加es:study→studiesfly→fliescarry→carriescry→cries但在y前如果为元音则直接加s:buyssays四．时间标志：always,usually,often,sometimes,every…一般现在时练习题I.用下列单词的适当形式填空1.Weoften___________(play)intheplayground.2.He_________(get)upatsixo’clock.3.__________you_________(brush)yourteetheverymorning?4.What________________(do)heusually________________(do)afterschool?5.Danny________________(study)English,Chinese,maths,scienceandArtatschool.6.Mikesometimes__________(go)totheparkwithhissister.7.Ateightatnight,she__________(watch)TVwithhisparents.8.________Mike________(read)Englisheveryday?9.Howmanylessons_________yourclassmates________(have)onMonday?10.Whattime_________hismother_________(do)thehousework?II.改句子1.Doyouoftenplayfootballafterschool?(改为肯定句)2.Ihavemanybooks.（改为否定句）3.GaoShan’ssisterlikesplayingtabletennis（改为否定句）4.ShelivesinasmalltownnearNewYork.（改为一般疑问句）5.IwatchTVeveryday.（改为一般疑问句）6.Wehavefourlessons.（改为否定句）7.Nancydoesn’trunfast（改为肯定句）二、现在进行时一、概念现在进行时表示说话时正在进行或发生的动作,也可表示当前一段时间内的活动或现阶段正在进行的动作。结构：助动词be(am/is/are)+现在分词.二、现在分词的构成：1.大多数动词后可在动词后直接加-ing．Eg:carry-carrying,catch-catching,drink