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1. There are three reasons for this.

2. The reasons for this are as follows.

3. The reasons 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.

For example:

There are three reasons for the changes that have taken place in our life. Firstly, people’s 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 prefer to enjoy modern life.

二、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.

For example:

Books are like friends. They can help us know the world better, and they can open our minds and widen our horizons. Therefore, reading extensively is of great benefit to us.

三、表示坏处

1. It has more disadvantages than advantages.

2. It does us much harm.

3. It is harmful to us.

For example:

However, everything divides into two. Television can also be harmful to us. It can do harm to our health and make us lazy if we spend too much time watching television.