1.The reason for this is not far to seek.
2.The reasons for this are as follows.
3.We have good reason to believe that...
1.It has the following advantages.
2.It benefits us quite a lot.
3.It is of great benefit to us.
1.It has more disadvantages than advantages.
2.It is reported/estimated/said/thought/believed that….
3.It does us much harm than another.
1.We should solve the problems that we are confronted with...
2.We should take some effective measures.
3.In other words/Namely/To put it another way/ That is to say, ….
1.It is good to learn at another man's cost.
2.No one can call back yesterday;Yesterday will not be called again.
3.One today is worth two tomorrows.
4.Never deter till tomorrow that which you can do today.
5.Take time when time cometh,lest time steal away.