讓步

　　1. now that …… 既然…… [讓步從句]

　　eg. Now that the decision has been made, we must try our best to carry it out.

　　2. unless…not… [ 讓步從句]

　　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綜合考慮]