I．．．．has both advantages and disadvantages．……既有利又有弊。例如：
1．Obviously television has both advantages and disadvantages．
2．Living in a city has both advantages and disadvantages．
3．Compared with cars，bikes have their advantages and disadvantages．
舉一反三：
1．Although computers bring people a lot of convenience，they have many disadvantages．
2．．．．has many advantages．For example，．．．However，just as every coin has two sides，．．．has its disadvantages．（本例將利弊分開講，轉折過渡自然。just as every coin has two sides也很值得背誦。）
II．．．．play（s）an important role ／part in．．．……在……中扮演重要角色／起重要作用。例如：
1．Computers play an important role in science and technology．
2．Computers play a more and more important role in our
life．
Computers play an increasingly important role in our studies．
3．Education plays an important part in developing our mind．
4．Addiction to alcohol and drugs play a role in homelessness．
舉一反三：
1．Advertisement plays an informative role in our daily life．
2．In the past，letters played a decisive role in long-distance communication．But now ，telephone，email，fax have taken their place．
III．With the development of．．．，隨著……的發(fā)展，例如：
1．With the development of our economy，m any Chinese families can afford a car．
2．With the development of our economy and society，pollution is more and more serious．
3．With the rapid development of science and technology，people can get a college degree by taking online-courses at home．
4．With the current social and technological developments，employees with more knowledge and higher academic degrees are needed．
舉一反三：
1．With the rapid increase of China's population，housing problem is becoming more and more serious．
隨著中國人口的急劇增加，住房問題越來越突出。