连词有：although/ though, even if/ even though, however, whatever,… wh-ever.
(1) although/though引导的让步状语从句
although和though，都作"虽然;尽管"解，通常可以换用，although的语气较重。如果要强调"但是"语气，可使用yet，still或nevertheless来表示"但是"、"依然"或"然而"之意，但是不能与but连用。
Although they have been talking for a long time, he cannot make her believe him.
= _________________________________________________________________________.
虽然和她谈了半天，他还是不能让她信任自己。
The text is few new words, but the students can't understand.
= _________________________________________________________________________.
这课文几乎没有新单词，但是学生们不能理解。
(2) even if引导的让步状语从句
even if "即使，纵然"，从句表示的是尚未发生的动作或存在的情况。如：
Even if it rains tomorrow，_______________________________________________.
即使明天下雨，我们也不改变计划。
Even if I failed again, I will not _____________ the experiment.
即使我再次失败，我也不会放弃实验。
(3) even though引导的让步状语从句
even though"虽然，尽管"，从句所表示的是已经发生的动作或存在的情况，通常可以和although/though换用。如：
Even though I didn't understand a word，I kept smiling.
即使我一个字也不懂，我还是保持微笑。
Even though you say so，I do not believe it.
即使你这样说，我也不信。
(4) whatever/no matter what引导的让步状语从句
Whatever等于no matter what，用法相同，都作"无论什么"解，后者多用于非正式文体。如：
Whatever/No matter what he says，don't go.
不管他说什么，你都不要走。
We are determined to fulfill the task，___________________________________________.
不管发生什么了，我们决心完成任务。
，我们将会及时处理。
