Alvin英语语法强化练习现在进行时定义：现在进行时表示正在发生或进行的动作。结构：be(am,is,are)+动词现在分词形式（简写：be+动词-ing）A、肯定句主语＋be(am,is,are)+现在分词，如：IamreadingEnglish.我正在读英语。Heiswriting.他正在写字。B、一般疑问句Be(Am,Is,Are)+主语＋现在分词?如：Areyousinging?你正在唱歌吗？C、否定句主语＋be(am,is,are)+not+现在分词Iamnotdoingmyhomework.我不在做作业。2.关键词：(1)now、atthemoment此时此刻（四年级才会学到）(2)句前有提示词look、listen3.动词-ing的构成规则（1）一般情况下，直接加ing，如：cook-cooking（2）以不发音的e结尾，去e加ing，如：make-making,taste-tasting（3）如果末尾是一个元音字母和一个辅音字母，双写末尾的辅音字母，再加ing，如：run-running,stop-stopping（4）以ie结尾的动词，先把ie变成y再加-ing。lie-lyingtie-tyingdie-dying注意：see-seeingdraw-drawinglisten-listening还有两个在网上看到的口诀，比较有帮助；现在分词构成口诀现在分词很好记，动词后缀-ing。直接加、去e加、双写加。还有一点要注意ie要用y来替。现在进行时用法口诀主语在前be在后，现在分词跟着走，其他成分不可丢。变一般很简单，把be提到句子前，否定句也不难，be后要把not添。还有一点要注意，动作提问doing替。现在进行时态练习题将下列动词变成ing形式help_______come_______swim_______eat_______give_______find_______sit_______write_______tie_______make_______play_______clean_______catch_______walk_______ride_______run_______draw_______listen_______begin_______dance_______watch_______sleep_______see_______have_______二．用所给词的适当形式填空。1.Look!Theboy(read)books.2.Thegirls_________(have)breakfastnow.3.—he(clean)theblackboard?—No,heisn’t.4.Tom(play)footballontheplaygroundatthemoment.5.Listen!They(sing)inthemuiscroom.三．汉译英。1.我们正在看电视。WeTV.2.Tom在图书馆看书。Tombooksinthelibrary.3.康康在操场上打篮球。Kangkangbasketball.4.他此刻正在睡觉。Heissleeping.5.玛利亚在做什么？WhatMarianow?6.你在做作业吗？Youyourhomework?四．完成下列现在进行时的句子1.Thestudents___________(listen)totheteachernow.2.LiLei______________(watch)TVnow.3.She___________(look)atanicepicturenow.4.Look!Theboys______________(play)basketball.5.Listen!They_____________(sing)asong.6.Acat_____________(run)upthetreenow.7.I____________(get)upnow.8.Hermother______________(wash)thedishesnow.9.He_____________(go)totheparknow.10.They___________(sit)inthepark.11.Mymother______________(clean)theroomnow.12.She____________(drink)somemilk.13.Acat______________(sleep)behindthedoor.14.BillyandBob_______________(play)football.15.They_____