精选优质文档-倾情为你奉上be动词、助动词、情态动词讲解 (基础篇)1、be动词的用法。beam / isare现在时waswere过去时单数复数英语中,be动词选用单数还是复数,要由主语来定,主语是单数,就用单数,反之用复数。 句中含有be动词时:肯定句: 主语be 其他否定句: 主语 be not 其他一般疑问句: Be 主语其他 ? 特殊疑问句: 疑问词(what / who / when / where) be 主语 其他 ?I am a teacher. You are right. She is 16 years old. My father is at home. The students are playing games. My teacher was ill yesterday.