英语翻译为什么用until 而不用when,或since,或after

英语翻译为什么用until 而不用when,或since,或after 英语翻译为什么不用early，而用earlier it wasn't until after 1825 这个翻译为:直到1825年吗?为什么要用wasn't,而不用it was until after 1825 He didn't leave here until the rain stopped.在这句话中为什么用leave 而不用left? in the wild,penguins may live for up to 20 year.为什么介词用for而不用until? 英语翻译为什么用in need of 而不用needing 英语翻译为什么这里用stretch out而不用stretch 英语翻译我想具体知道为什么用for而不用of 英语翻译为什么用needn't而不用don't need, you weren't supposed to come back until tomorrow这里为什么用were?而不用一般现在时如果是虚拟语气的问题, The worker said that the train would not leave until ten,(didn't he)?为什么用did't而不用wouldn't? Don't worry .it (won't begin )until the bell rings.为什么括号里用won't 而不用doesn't? He didn’t go to bed until twelve o‘clock last night这句话中的didn't go为什么用didn't而不用肯定的词语,句子中didn't是否定的吗not.until是直到. He didn’t go to bed until twelve o‘clock last night这句话中的didn't go为什么用didn't而不用肯定的词语,句子中didn't是否定的吗not.until是直到. 英语翻译用until做 为什么这个句子用until不用when 并翻译until recently,Anna worked as a teacher in Japan. until 前面可不可以用was doing 为什么用his father was sitting in the sofa when he came in 而不用为什么用his father was sitting in the sofa when he came in 而不用his father was sitting in the sofa until he came in I will not tell him until he comes back tomrrow.为什么come要用单三而不用将来时