be动词用法歌：我用am,你用are，is连接他，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。 解析: I am; You are; He is;She is; It is; We are; You are; They are.练习: 一、用am, is, are 填空1)I_astudent. 2) You_adoctor.3) _shefromJinan? 4) _youAmerican?5) He_inClass4,Grade1.6) It_acar. 7) They_cars 8) _yourmotherinChina?9) _yourfriendsinNewYork?10) What_hername? 11) These_buse
