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系动词Be(am,is,are)的用法一、请记住以下口诀：我用am，你用are，is连着他，她，它；单数名词用is，复数名词全用are。变疑问，往前提，句末问号莫丢弃。变否定，更容易，be后not莫忘记。疑问否定任你变，句首大写莫迟疑。二、Be动词在一般过去时中的变化：1．am和is在一般过去时中变为was。（wasnot=wasn’t）2．are在一般过去时中变为were。（werenot=weren’t）3．带有was或were的句子，其否定、疑问的变化和am,is,are一样，即否定句在was或were后加not，一般疑问句把was或were调到句首。相关练习题一、用am,is,are填空1.I______aboy.______youaboy?No,I_____not.2.Thegirl______Jack'ssister.3.Thedog_______tallandfat.4.Themanwithbigeyes_______ateacher.5.______yourbrotherintheclassroom?6.Where_____yourmother?She______athome.7.How_______yourfather?8.MikeandLiuTao______atschool.9.Whosedress______this?10.Whosesocks______they?11.That______myredskirt.12.Who______I?13.Thejeans______onthedesk.14.Here______ascarfforyou.15.Here______somesweatersforyou.16.Thetwocupsofmilk_____forme.17.Sometea______intheglass.18.Gaoshan'sshirt_______overthere.19.Mysister'sname______Nancy.20.This______notWangFang'spencil.21.______DavidandHelenfromEngland?22.There______agirlintheroom.23.There______someapplesonthetree.24._______thereanykitesintheclassroom?25._______thereanyapplejuiceinthebottle?26.There_______somebreadontheplate.27.There_______aboy,twogirls,threemenandtenwomeninthepark.28.You,heandI______fromChina.二、用be动词的适当形式填空1.I_______atschooljustnow（刚才）.2.He________atthehotellastweek.3.We________studentstwoyearsago.4.They________onthefarmamomentago(刚才).5.YangLing________elevenyearsoldlastyear.6.There________anappleontheplateyesterday.7.There________somemilkinthefridgeonSunday.8.Thephone_______onthesofayesterdayevening.9.I______anEnglishteachernow.10.She_______happyyesterday.11.They_______gladtoseeeachotherlastmonth.12.HelenandNancy________goodfriends.13.Thelittledog_____twoyearsoldthisyear.14.Look,there________lotsofgrapeshere.15.Today_____thesecondofJune.Yesterday______thefirstofJune.It_____Children’sDay.Allthestudents______veryexcite