表方式，比较
　　1. (Just) as …, so… 正如… [ 比较句型 ]
　　eg. Just as water is the most important of liquids, so air is the most important of gases.
　　2. in much the same way/manner that… 正如…, 和…一样
　　eg. The Americans spend Christmas Day in much the same way that the Europeans do.
　　表让步
　　1. now that …… 既然…… [让步从句]
　　eg. Now that the decision has been made, we must try our best to carry it out.
　　2. unless…not… [ 让步从句]
　　eg. It is a vicious cycle and unless you consider these social, economic and environmental problems in one context, you are not serious about meeting the challenges. [注意例句中的consider sth. in one context句型:把什么事情放在一起加以综合考虑]

　　表假设
　　Supposing……, it is likely that…. 假设…, 那么很可能… [假设, 虚拟语态]
　　eg. Supposing you wanted to buy a washing machine, it is more than likely you would obtain details regarding performance, price, etc. from an advertisement.