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初中英语语法几大基本时态讲与练(2)


    大家知道,谓语的动词用来表示动作(情况)发生时间的各种形式称为时态。
    现在进行时表示:1、现在(说话的瞬间)正在进行或发生的动作,强调“此时此刻”。E.g. He is reading . They are talking now.
    2、当前一段时间内的活动或现阶段正在进行的动作。E.g. They are working these days.
    3、某些动词的现在进行时,表预定的计划或即将发生的动作。E.g I am coming.
    其结构为be+现在分词. 现在分词的变法有:
    1、一般在动词词尾加上-ing , E.g. jump
    2、以不发音字母e结尾的动词,先去e,再加-ing. E.g have write
    3、.以重读闭音节末尾只有一个辅音字母结尾的词,它前面是单个元音字母时要先将词尾的辅音字母双写,再加上-ing. E.g. sit put
    其句式变换都在be上做文章。
    E.g. He is buying a bike.
    Is he buying a bike?
    He isn’t buying a bike.
    一般由look,listen,now, at this moment等时间状语做标志。
    尽管现在进行时比较简单,但在做题过程中也常会犯一些错误,常见的错误有如下几种:
    自我检测
    (一) 、单选
    1、 Look! He _____their mother do the housework.
    A. is helping B. are help C. is help D.is helpping
    2 、_____are the boys doing ? They are singing in the room.
    A .Who B .How C.What D.Where
    3、 Don’t talk here. My mother _____.
    A. is sleeping B .are sleeping C. sleeping D .sleep
    4 、Danny ______. Don’t call him.
    A. is writeing B .is writing C.writing D .writes
    5 、–When_____he_____back?
    – Sorry, I don’t know.
    A. does,come B.are coming C.is come D.is coming
    答案:A C A B D
    (二)、填空
    1、 It’s ten o’clock. My mother _____(lie)in bed.
    2、 What____he _____(mend)?
    3、 We _____(play)games now.
    4、 What ____you____(do) these days?
    5、 ____he ___(clean) the classroom?
    6、 Who____(sing)in the next room?
    7 、The girl____(like)wearing a sweater. Look! She ____(wear)a red sweater today.
    答案:1 is lying 2 is mending 3 are playing 4 are doing
    5 Is cleaning 6 is singing 7 likes ; is wearing
    一、把动词变成现在分词形式易出错
    例:1、They are swiming.(swim)
    2 、Jenny is plaiing(play)football.
    答案:1.swimming 2 .playing
    解析:动词变现在分词可有如下口诀:“一添一去y不变”. “一添”指双写规则;“一去”指去掉不发音字母e规则;“y不变”指要与名词变复数区分开。
    二、丢掉be动词或忘记把动词变成现在分词
    例:1、 Look,two children flying.(fly) a kite in the park.
    2 、Li Mingisn’t read ( not read) a book in bed now.
    答案:1 are flying 2 isn’t reading
    解析:现在进行时肯定句的结构规律为: “be+现在分词,缺一不可”。这一点必须牢记。
    三、对动词或动词词组提问时丢掉doing
    例:1 、The students are singing in the room.(对划线部分提问)
    What are the students in the room?
    答案:What are the students doing in the room?
    解析:现在进行时态中对动作提问可记住此句式“What +be +主语+doing+其它?”
    或简写为“What......doing......”?句式。
    四、现在进行时态的选择疑问句中易忽视or后用现在分词形式
    例:孩子们在跑还是在跳?
    Are the children running or jump?
    答案:Are the children running or jumping?
    解析: or连接的是两个并列成分,动词形式须一致。
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