For this purpose 为此 wei ci Once this has been done 一旦这项工作完成 yi dan zhe xiang gong zuo wan cheng Usually, 通常 tongchang Compared to A, B is 相对于 a b 是 xiang dui yu a b shi In order to 为了 wei le Before doing… we must…. 在干。。。前，我们必须干。。。 zai gan 。。。qian，wo men bi xu gan。。。 It is surprising to find that… 惊讶的发现 jing ya de fa xian As long as 只要 zhi yao Unless… 除非 chu fei Only once A has happened, then B A 发生了，B才发生 A fa sheng le ,B cai fa sheng i need a break ,if you want to learn more (free) ,please call me ,skype id :hero7702 msn:[email protected]