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1)The reason for this is that…

2)The reason for this is obvious.

3)There are three reasons for this.

1)It does us a lot of good.

2)It benefits us quite a lot.

3)It has the following advantages.

1)It is harmful to us.

2)It has more disadvantages than advantages.

3)It dose us much harm.

1)It is important(necessary,difficult,convenient,possible) for sb. to do sth.

2)We think it necessary to do sth.

3)It plays an important role in our life.

1)We should solve the problems that we are faced with.

2)We should try our best to overcome the difficulties.

3)We should take some effective measures

1)Some changes have taken place in the past five years.

2)The computer has brought about many changes in education.

1)We can not ignore the fact that...

2)No one can deny the fact that...

3)This is a case that many people are interested in.

1)I prefer to reading rather than watching TV.

2)Compared with A，B..

1)It has increased(decreased)from...to...

2)The population in this city has now increased (decreased)to 800，000.

1)People have different opinions on this problem.

2)Some people believe that...Others argue that...