3.状语从句：
状语的种类特别多，所以状语从句是你最能够表现句型多样化的机会。牢记以下几种状从的分类，句子的丰富性自然就出来了：
A.时间状语从句(引导词：when/as/while/since/the moment...)
E.g.:
The related sectors should take effective measures the moment the problem appeared.
B.地点状语从句(引导词：where/wherever)
E.g:
Generally，air will be heavily polluted where there are factories.
C.原因状语从句(引导词：because/since/as/seeing that...)
E.g:
As this policy would also affect the cost of public transport, it would be very unpopular with everyone who needs to travel on the roads.
D.条件状语从句(引导词：if/as long as/providing that/provided that...)
E.g:
The government will increase its support for public education, provided that such funds can be put to good use.
E.让步状语从句(就是转折关系，引导词：though/although/while/no matter who/where/which/how...)
E.g:
*While (表示二者对比)some people link happiness to wealth and material success, others think it lies in emotions and loving personal relationships.
*Even though it is unlikely that all workers do feel happy in their work, I think it is not unrealistic to promote more job satisfaction in any job.
