虽然天空下着小雨，但我还是很想出去。

Although it is snowing，it is not very cold.

虽然下着雪，但天并不是很冷。

(2)though作"尽管"讲，引导的让步状语从句可以倒装，但although没有这种用法。如：

Poor though he is，he is happy.

尽管很穷，但他很开心。

Child though she was，the actress drew wide audiences.

尽管这个女演员还是个孩子，却吸引了大批观众。(child前不用冠词a)

(3)although只用作连词，而though除作连词外，还可用作副词，常置于句末；句子较长时，也可置于句中。如：

He's a bad manager.There's no reason，though，to dismiss him.

他是个差劲的经理，然而还是没有理由免他的职。

(4)although和though用作连词时不能和but连用，但可以和yet，still等连用。如：

Although he lives alone，yet he is happy.(＝He lives alone，but he is happy.)

虽然独自生活，但他很开心。

2.while

while引导让步状语从句，意为"虽然；尽管"，置于句首。如：

While I am willing to help，I do not have much time available.

尽管我愿意帮忙，但是我没有很多时间。

While he likes the big house very much，he can't afford it.

虽然他很喜欢那所大房子，但他买不起。

3.as

as引导的让步状语从句要采用倒装语序。从句结构为：名词/形容词/副词/动词＋as＋主语＋谓语。如：

Cold as it was，he went on working.

尽管天气冷，可他仍继续工作。

Fast as you read，you can't finish the book in three days.

尽管你读得快，你也不可能在三天内读完这本书。

即时跟踪2　用although，though，as或while填空

(1)Although/Though/While TV has many benefits，it has some bad effects on people.

(2)Proud as/though they are，they are afraid to see me.

(3)He said he would come；he didn't，though.

(4)I don't believe we've met before，although/though I must say you do look familiar.