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1)It’s well known to us that ...
2)As is known to us，...
3)This is a topic that is being widely talked about.
4)From the graph(table，chart)listed above，it can be seen that ...
5)As aproverb says，“Where there is a will，there is a way.
例如：
As is well known to us，it is important for the students to know the world outside campus.
The reason for this is obvious.Nowadays，the society is changing and developing rapidly，and the campus is no longer an “ivory tower.As college students，we must get in touch with the world outside the campus.Only in this way can we adapt ourselves to the society quickly after we graduate.
再如：
Does it pay to be honest?This is a topic that is being widely talked about and different people have different opinions on it.
2.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.
例如：
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.
3.表示坏处
1)It has more disadvantages than advantages.
2)It does us much harm.
3)It is harmfulto us.
例如：
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 TV。
4.表示重要、必要、困难、方便、可能
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.