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
