n 现在我们来看以下的例子并观察看be动词是如何应用和变形n 1. I was late yesterday.n 2. We/They/You were at the toy store last night.n 3. He/She/I was in Shanghai last Sunday.练习.选词填空1. He _an astronaut before.A. is B. was C. were D. are2. -Where_you yesterday afternoon? -I _at school.A. is; am B. was; were C. were; was D. are; am3. There_many birds in the tree yesterday.A. are B. were C. was D. is4We _astronauts in the dream last nightA. are B. were
