以下是短文写作中使用率最高、覆盖面最广的基本句式，每组句式的功能相同或相似，考生可根据自己的情况选择其中的1－2个，做到能够熟练正确地仿写或套用。
．表示原因
）There are three reasons for this．
）The reasons for this are as follows．
）The reason for this is obvious．
）The reason for this is not far to seek．
）The reason for this is that．．．
）We have good reason to believe that．．．
