while后可加动词过去式吗,例如：I was left alone at his desk while he work

求Bob was at home alone one night.while his 的原文~ he was drawing something on the desk (while) i was reading a while his monther was cooking,he home the child fell sleep while he was doing his home work哪里错了 the child fell sleep while he was doing his home work(=@__@= he built his first computer while he was at university usein I was doing the house work while he was just sitting there r He was busy ___ (do)his homework while I was cooking berners-lee built his first computer while he was at univers 划分句子成分Berners-Lee built his first computer while he was at u his father was angry with him.because he __ __(做错事) while at While He Yan was at the doctor's.I was going…