He was boiling water over an open fire yesterday.翻译

He was boiling water over an open fire yesterday.翻译 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 Finally,the water was boiling.(改为同义句） _____,the water was boiling. water boiling和boiling water的区别? 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? 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? he was boiling drinking water over an open fire 这句话中的短语这里面的over an open fire是“在...上面”的意思?他和on 有什么区别? keep the water boiling为什么这里boiling要加ing boiled water boiling water hot water三者区别? He starts boiling water in a teapot to make the tea for the guests这句话哪错了? He starts boiling water in a teapot to make the tea for the guests这句话哪错 I hear the sound of water 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 boiled water 是指开水 boiling water是指沸水,是不是boiled表示动作已经完成但 He sat there,waiting for his mother,这里为什么要用waiting 动作不是已经完成了吗 不是应该用waited吗 by 和 with的使用 不太分得清 用by 还是with可以针对这两句话My finger was pricked by the sharp knife.My hand was scalded with the boiling water. 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、