mixbuildintroducediscussattendmop78．-Who___thefloor？Itlookssotidynow．-ItmustbeJack．He'salwaysthefirsttogettoschoolandhelpscleantheclassroom．79．-Icalledyoulastnight，butyoudidn'tanswerit．-I'm|小学英语问答-字典翻译问答网

mixbuildintroducediscussattendmop78．-Who___thefloor？Itlookssotidynow．-ItmustbeJack．He'salwaysthefirsttogettoschoolandhelpscleantheclassroom．79．-Icalledyoulastnight，butyoudidn'tanswerit．-I'm

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问题描述：

mix build introduce discuss attend mop

78．-Who___ the floor？It looks so tidy now．

-It must be Jack．He's always the first to get to school and helps clean the classroom．

79．-I called you last night，but you didn't answer it．

-I'm sorry．I___ my new teacher to my parents at that time．

80．-Where is your father？

-He___ his favourite TV show with his friends in the sitting room．

81．I hear that the Class Two students___ the concert（音乐会） in two weeks．

82．Those engineers___ a model of the future building and left for the USA for more ideas．

83．Tom often___ salt with sugar by mistake in the kitchen．

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　　78．hasmopped．考查现在完成时．根据英语提示，特别是"thefloor"（地板）和"tidy"（干净），确定选用mop的某种形式．mopthefloor拖地板．根据下文"Itlookssotidynow"所说，现在地板很干净，所以，是有人已经拖过了，故时态用现在完成时，即"have/has+过去分词"形式．主语为第三人称单数who，助动词选用has；mop的过去分词为mopped．故填hasmopped．　　79．wasintroducing．考查过去进行时．根据英语提示，特别是"mynewteachertomyparents"，确定选用introduce的某种形式．introducesbtosb把某人介绍给某人；introducemynewteachertomyparents把新老师介绍给我父母．根据上文，事情发生在过去，要用过去的某种时态．对方打电话时"我"正在向父母介绍新老师，所以没有听到他的电话，故用过去进行时，即"were/was+现在分词"形式．主语为第一人称I，助动词变为was；introduce的现在分词为introducing．故填wasintroducing．　　80．isdiscussing．考查现在进行时．根据英语提示，特别是介词"with"，确定选用discuss的某种形式．discusssthwithsb和某人讨论某事；discusshisfavouriteTVshowwithhisfriends和朋友一起谈论他最喜欢的电视剧．对话发生时，父亲正和朋友讨论，故用现在进行时，即"are/is/am+现在分词"形式．主语为第三人称单数he，助动词用is；discuss的现在分词为discussing．故填isdiscussing．　　81．willattend/aregoingtoattend．考查一般将来时．根据英语提示，特别是"theconcert"（音乐会），确定选用attend的某种形式．attend为动词，意思是参加．attendtheconcern参加音乐会．根据时间状语"intwoweeks"（两周后），确定使用一般将来时，即"will（begoingto）+动词原形"形式，也就是willattend或aregoingtoattend（主语为复数，助动词be变为are）．故填willattend/aregoingtoattend．　　82．built．考查一般过去时．根据英语提示，特别是amodel（一个模型），确定选用build的某种形式．buildamodel建造一个模型．根据下文"leftfor"的时态，该动作发生在过去，且两个动作一前一后，依次进行，故用一般过去时．build的过去式为built．故填built．　　83．mixes．考查一般现在时．根据英语提示，特别是介词"with"确定选用mix的某种形式．mixsthwithsth用（把）…和…混合在一起．mixsaltwithsugar把食盐和蔗糖混合在一起．本句说明的是汤姆的一贯做法，故用一般现在时．主语为第三人称单数Tom，动词mix要变为第三人称单数形式mixes．故填mixes