when he was boiling drinking water over an open

when he was boiling drinking water over an open the emperor Shen Nong discovered tea when he was boiling drinking water over fire 翻译 可以这样改句子吗3 When he arrived I was working in the garden.4 When he arrived I was typing letters.5 When he arrived I was shaving.6 When he arrived I was boiling the milk.7 When he arrived I was phoning to my sister.8 When he arrived I was He was boiling water over an open fire yesterday.翻译 一个句子~WHEN和WHILE得转换Shen None discovered tea when he was boiling the drinking water over an open fire.这里面得WHEN能不能换成WHILE～为什么? When he was a When was he at When was he born,为什么不是When was he bear? when was he born=--- ---- when was he ten 急用 he played when he was at Finally,the water was boiling.(改为同义句） _____,the water was boiling. 求中学英语课文《Who invented tea》全文其中的片段：the emperor shennong discovered tea when he was boiling drinking water over an open fire.Some leaves from near by bush fail into the water and remained their for some time等等…… ACCORDING TO AN ANCIENT CHINESE LEGEND,THE EMPEROR SHENNONG DISCOVERED TEA WHEN HE WAS BOILING DRINKING WATER OVER AN OPEN FIRE SOME LEAVES FROM A NEARBY BUSH FELL INTO THE WATER AND REMAINED THERE FOR SOME TIME.THE EMPEROR NOTICED THAT THE LEAVES IN He was boiling drinking water over an open fire.fire作火的时候不是不可数吗为什么前边有an? 关于过去式He is boiling some eggs,He boiled some yesterday.一、这是书上的一个例子,为什么变了过去式后不加was?二、如果he is boiling some eggs,完全改成过去式是不是就是he was boiled some eggs yesterday,三、 when was he born关于姚明 when he was seventeen?的同义句