一、观察I am a teacher.You are my students.She is a hard-working girl.He was a handsome boy.They were running on the playground this time yesterday.通过观察例句同学们会发现:在英语中,be动词主要用在一般现在时、一般过去时和过去进行时中,有不同的人称形式am/are/is/was/were。虚拟语气中没有主谓一致原则,如:If I were you,I would study hard. 一, 观察 I am a teacher.You are my students. She is a hard-working girl. He was a hard-working girl. He was a hard-working girl. He was a hard-working girl. He was running on the playground this time yesterday. The verbs are used mainly in the present, in the past, in the past, and in the past, in different forms of person am / are / is / was / were. There is no principle of verbosity in the subjunctive mood, such as: If I were you, I would study hard.