江苏省永丰初级中学八年级英语上册 Unit 8 Natural disasters Grammar课件 （新版）牛津版.pptVIP

What was the rabbit doing just now? What was the pig doing just now? He was jumping just now. He was dancing just now. The rabbit was jumping while the pig was dancing. The worm was eating while the dog was reading. Two long actions went on at the same time. We were clapping our hands while the teachers were walking across the park. The rabbit was jumping while the pig was dancing. The worm was eating while the dog was reading. While the pig was dancing, the rabbit was jumping. While the dog was reading, the worm was eating. while, when and as 都表示“当……的时 候”。 e.g. I was sleeping when the earthquake started. People were running in all directions while pieces of glass and bricks were falling down. As I was trying to find my way out, I suddenly heard some noise above me. 1. 当连接同时发生的两个延续性长动作时，常用while引导。 e.g. While I was watching TV, he was listening to music. Millie was reading a book while Eddie was sleeping. 2. 如果短暂性的动作是主句时，我们可 以用when, while 或 as 引导。 e.g. When/while/as Millie was watching TV, Andy came into the room. 3. 如果延续性的动作是主句时，我们经 常用when 来连接。 e.g. Millie was watching TV when Andy came into the room. 4. 如果两个短暂性的动作同时发生，我 们通常用as 连接。 e.g. As Millie sat down on the sofa, Andy came into the room. 注：当一个短暂性动作发生的同时伴随 着一个延续性的动作，这时我们通 常用过去进行时来表示延续性的动 作，用一般过去时来表示短暂性的 动作。 Playing in the snow Some Class 1, Grade 8 students went to play in the snow. Complete the sentences with the correct forms of the verbs in blanks. Use when, while and as to connect the sentences. _______ Simon _________ (arrive), Amy ___________ (get) some snow from the ground. 2. _______________ Suzy and Kitty ____________ (build) a snowman, Millie ___________ (take) photos. 3. Daniel _______ (fall) over _____________ he ____________ (make) a big s