Unit 5 Sports Day Part B,Peter is running 100 meters, he is running fast,Lets learn,Yangming is doing high jump, he is falling down,Come on, Lily is shouting,Sally is busy, she is taking photos,Grammar,be doing,1. be doing 表示现在进行时，正在做某事,如：Im doing my homework. 我正在做作业。 She is eating food. 她正在吃东西。 We are reading books. 我们正在看书,2. be doing 表示将来，仅限于某些瞬间动词或表示位移的动词，如come, go, start, leave, begin等,如：1. The meeting is beginning soon. 会议马上就要开始了。 2. The train is leaving. 火车马上就要开了。 3. Im coming. 我马上就到,Lets
