重点讲解：
1. as soon as
一…就…；
eg. As soon as the two chicks hatch, they leave the nest burrow.
两只小鸟一出壳就离开了巢穴yhXwPnGR4h-)&-h。
eg. Let us start as soon as he comes.
等他一来我们就动身u!IIsTOoz^~VLs5%S。
2. be supposed to
本应该（发生而没有发生）；
eg. They were supposed to be here an hour ago.
他们应该在一小时以前到达这里6;M=7gBZn|a。
eg. Whoops, you weren't supposed to hear that.
唉，你不该听到这事的MDRN[I!@b%n1q!d。
3. in order to
为了；以便；目的在于；
eg. John and Jack had dropped behind in order to be alone and have a talk.
为了能单独在一起谈谈，约翰和杰克故意走在别人后面vhyuFxCuN_0oA。
eg. In order to compass our object we must work hard.
为了达到我们的目标，我们必须努力工作*kwrDq;07B。