例： The housing problem that we are confronted with is becoming more and more serious.Therefore，we must take some effective measures to solve it.

6.表示变化

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

　　2)A great change will certainly be produced in the world’s communications.

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

　　例： Some changes have taken place in people’s diet in the past five years.The major reasons for these changes are not far to seek.Nowadays，more and more people are switching from grain to meat for protein，and from fruit and vegetable to milk for vitamins.

7.表示事实、现状

　　1)We cannot ignore the fact that...

　　2)No one can deny the fact that...

　　3)There is no denying the fact that...

　　4)This is a phenomenon that many people are interested in.

　　5)However，that’s not the case.

　　例： We cannot ignore the fact that industrialization brings with it the problems of pollution.To solve these problems， we can start by educating the public about the hazards of pollution.The government on its part should also design stricter laws to promote a cleaner environment.