演绎法常用的句型

　　1. There are several reasons for…, but in general, they come down to three major ones.

　　2. There are many factors that may account for…, but the following are the most typical ones.

　　3. Many ways can contribute to solving this problem, but the following ones may be most effective.

　　4. Generally, the advantages can be listed as follows.

　　5. The reasons are as follows.