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 that.……
6）We have good reason to believe that.……
例如：
There are three reasons for the changes that have taken place in our life.Firstly，peoples living standard has been greatly improved.Secondly，most people are well paid， and they can afford what they need or like.Last but not least，more and more people pre
注：如考生写第一个句子没有把握，可将其改写成两个句子。如：Great changes have taken place in our life. There are three reasons for this.这样写可以避免套用中的表达失误。
表示数量
1）It has increasedfrom.……to.……
2）The population in this city has now increased to 800，000.
3）The output of July in this factory increased by 15% compared with that of January.
例如：
With the improvement of the living standard，the proportion of peoples income spent on food has decreased while that spent on education has increased.
再如：
From the graph listed above，itcan be seen that student use of computers has increased from an average of less than two hours per week in 1990 to 20 hours in 2000.
注：“From the graph listed above，it can be seen that”