英語(yǔ)的be動(dòng)詞有三個(gè)is am are 用法:助詞 1.(與動(dòng)詞的現(xiàn)在分詞連用,構(gòu)成各種進(jìn)行時(shí)態(tài))正在...,在...I won't be free this afternoon.I'll be seeing a friend off.我今天下午沒(méi)空,我要給朋友送行.What were you doing...請(qǐng)問(wèn)be可以直接用嗎，有些填空里面答案不是am/is/are，而是beam is are 的區(qū)別 am只用在I 后面, 如 I am a girl 我是女孩 第三人稱單數(shù)后面跟 is 如 He/She/It/Jim/is 其他跟 are, 如 They/we/girls/boys are什么情況下用Be借助外加助動(dòng)詞如do,did.或者在情態(tài)動(dòng)詞如can,will,would,could,should,may,might之后都必須使用be, 而不能直接用am is are. 例如，要說(shuō)He can be a teacher. 而不能說(shuō) He can is a teacher. 同樣的，He is a teacher 是正確的說(shuō)法，He be a teacher 就是錯(cuò)誤的說(shuō)法了。