1.although较正式,语气强
Although he was tired,he went on working.
2.although引导的从句放在主句前后均可,有时还可放在句中.
Although many difficulties are still ahead,we are determined to make greater achievements.尽管在前面的道路上还有许多困难,但是,我们决心要取得更大的成就.
He often helps me with my English although he is quite busy.尽管他相当忙,但是还常常帮我学英语.
3.although引导的从句不能与but,however连用,但可与yet,still连用.不能说：Although he was old,but he worked hard.应把but去掉.当然,保留but而去Although也可.
注意:although 的几不:
although不能指假设的情况
although不能作并列连词
although不能作副词,放在词尾
as long as 翻译成只要...就
1.As long as you don't betray me,I'll do whatever you ask me to (do).
只要你不出卖我,要我做什么我都愿意.
2.We'll ship the goods at an early time as long as there is a steamer.
只要有船,我们就尽早装货.
3.As long as live,I will help you.
只要我活着,
引导让步状语从句
常放在句首,译作“尽管”、“虽然”,比although或 though语气要轻.例如：
1.While I believe it is true,I cannot prove it.
虽然我相信那是真的,但我无法证明.
2.While any kind of athletic shoe can provide a certain amount of rebound,
energy-return sneakers are designed to maximize this effect.
虽然任何一种运动鞋都能提供一定的反弹力,但回力运动鞋能够使这种效果最大化.
三、引导条件状语从句
相当于as long as,译作“只要”.例如：
1.While there is life,there is hope.
有生命,就有希望.
2.While a spark of life remains,it is a doctor's duty to save the patient.
只要病人还有一息生机,医生就有责任挽救.
