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。
1.CONJ-SUBORD虽然（表示对比）You use although to introduce a subordinate clause which contains a statement which contrasts with the statement in the main clause.
Although he is known to only a few, his reputation among them is very great...虽然知道他的人不多，但他在这些人中名声却很响。
Although the shooting has stopped for now, the destruction left behind is enormous.虽然枪战目前已停止，但造成的破坏是巨大的。
2.CONJ-SUBORD虽然（表示惊奇或出乎意料）You use although to introduce a subordinate clause which contains a statement which makes the main clause of the sentence seem surprising or unexpected.
Although I was only six, I can remember seeing it on TV...
虽然那时我只有6岁，我依然记得在电视上见过它。
Although he was twice as old as us, he became the life and soul of the company.
虽然他的年纪是我们的两倍，但他却成为了公司的灵魂人物。
3.CONJ-SUBORD尽管，即使（表示让步）You use although to introduce a subordinate clause which gives some information that is relevant to the main clause but modifies the strength of that statement.
He was in love with her, although he did not put that name to it.他爱着她，虽然他没有将其称为爱。
4.CONJ-SUBORD尽管；虽然（表示承认所述是事实）You use although when admitting a fact about something which you regard as less important than a contrasting fact.
Although they're expensive, they last forever and never go out of style...
尽管价格昂贵，但它们经久耐用，永不过时。
Although not ideal, this attitude is not entirely destructive.这种态度虽然不够理想，但还不至于消极透顶。
一、以what引导的感叹句，一般有三种形式，此时what为形容词，作定语，用来修饰它后面的名词或词组。
1、what+a/an+形容词+可数名词单数+主语+谓语！例如：
What a good girl she is! 她是个多么好的一个女孩啊！
2、what+形容词+不可数名词+主语+谓语！例如：
What bad weather is it? 多么糟糕的天气啊！
3、what+形容词+可数名词复数+主语+谓语。例如：
What good students they are! 他们是多么好的学生啊！
二、how引导的感叹句也有三种结构形式。此时how是副词，用来修饰其后的形容词或副词，也可以修饰动词。
1、How+形容词+主语+谓语！例如：
How hot it is today! 今天多么热呀！
2、How+副词+主语+谓语！ 例如：
How fast he runs! 他跑得多么快呀！
3、How+主语+谓语！ 例如：
How time flies! 光阴似箭！
在平时做练习时，我们常会碰到陈述句改为感叹句的句型转换题，不少同学对此感到棘手，这里介绍一种行之有效的方法：“一断，二加，三换位，四去very”。现以She is a very clever girl.为例。
二加：先在句首加上what或how，what是形容词，作定语，修饰名词。How为副词，作状语，用于修饰形容词、副词或动词。除修饰动词外，how修饰的词常放在其后面，判断用what还是how，就看陈述句中最后一词，是名词用what，是形容词或副词用how。上述例句是girl，所以用what。二加还要在句末加上感叹句，即：“what……！”
三换位：将“一断”之后的第一部分和第二部分对换位置，即：
What a very clever girl she is !
四去very：感叹句本身表达一种强烈的感情，如“多么、十分”等。故陈述句变为感叹句时，very一词应去掉，以免重复。故上述例句的转换是：
What a clever girl she is !
What与how有时也可以互换；what+a/an+形容词+可数名词单数+ 主语+谓语！=How+形容词+a/an+可数名词单数+主语+谓语！
例如：
What a clever girl she is! = How clever a girl she is!
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