While waiting,he saw a beautiful girl.这句话有无错误?还有,为什么while后面要加现在分词啊?

While waiting,he saw a beautiful girl.这句话有无错误?还有,为什么while后面要加现在分词啊? 英语翻译While waiting for a bus to the office where he was supposed to be interviewed,he saw an elderly man wildly kicking the tyre of his car.1、请解释be supposed to 2、请标准翻译这个句子, While he was waiting for the bus, he was reading a newspaper.为什么用while引导 While i was waiting to enter university,i saw in a newspaper a teachini job While -----（buy） tickets,I saw many people jump the queue instead of waiting in line. when he was waiting for the bus,he saw a dog.改错怎么改,为什么? He looked for his sister.He saw a car accident happen.用while连成一句话. 英语的几个句子,我有点弄不清楚意思1:They drove in silence across town through the rain.2:While they were waiting at a stoplight he looked at her in the mirror and he saw that she was crying.3:He drove all the way back to the house and while he was looking for me,i saw him first.同义:_____he was looking for me,i saw him_____he could_____me. while he saw his mother ,the boy stopped crying.为啥用while as soon as 那用when while Tom saw the UFO,he was walking down the street with his friends有一处有错, the witness insists that she__the thief while he was stealing 应该填saw,请问为什么呢 John looked for his sister.He saw a car accident happen.(用while连成一句) While flying over the channel ,the pilot saw what he thought to be a meteorite John looked for his sister. He saw a car accident happen.用While连成一句怎摸说 While Tom was playing with the balloon,he saw a plane ___ (fly) over his head. On a cold winter night ,while Mary was driving home,she saw a short old man,covered with someold cloth ,shaking with the cold .''what a poor man!Maybe he's waiting for someone to l______him some money or food.''Mary thought and looked around .Some pe 新概念二35 he saw two thieves rush out of a shop and run towards a waiting car.waiting是动名词吗