表示原因1)There are three reasons for this。2)The reasons for this are as follows。3)The reason for this is obvious。4)The reason for this is not far to seek。5)The reason for this is that6)We have good reason to believe that表示好处1)It has the following advantages。2)It does us a lot of good。3)It benefits us quite a lot。4)It is beneficial to us。5)It is of great benefit to us。表示坏处1)It has more disadvantages than advantages。2)It does us much h