Great changes have taken place in the past few years in Beijing.
变形：Beijing has taken on a new look.
Beijing is no longer what it used to be.
I’m delighted to receive/get your letter dated/of Fed.12,2006.
联想：月份Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sept. Oct. Nov. Dec.
星期Mon. Tues. Wed. Thurs. Fri. Sat. Sun.
I’m looking forward to hearing from you soon. [be look forward to doing]
To sum up,what an important role email plays in our daily life!
延伸：表“总之”的词组：To sum up ; All in all ; In a word ; As is mentioned above
Not only do I take interest in English,but I am fond of music as well,especially classical music.
注意：not only+倒装，but also+不倒装
In addition,we will invite Mr.johnson,a famous professor from Tsinghua University,to give us a speech on birdflu in the reading-room on the second floor of our library.
I was walking on the way to school when all of a sudden I heard “Help!Help!”from not far away.
East of the teaching building stands a lab building,where we do a wide variety of experiments every day.
联想：a wide variety of = varieties of
There are plenty of students playing basketball on the playground,dreaming of becoming another Yao Ming one day/some day.
As is shown from the graph,40%of the students in our grade go in for sports after school.
联想：As is shown from the graph可用As we can see in the graph代替
I ran over to the river bank,took off my overcoat,and then jumped into the icy water without any hesitation.
I was just about to go out when suddenly it began to rain.
To my surprise,those people put up illegal ads here and there,regardless of the result.
Many ancident trees have been seriously destroyed in this big fire.
He has a wide variety of hobbies,such as swimming,singingas well as skating.
Some cut down trees without any thinking,some hunted birds for fun,and others littered the rubbish everywhere,which had a bad effect/influence on the surroundings.
At one time,it was not until 11o’clock that Li Ming went to bed in attempt to make up for the lost lessons.
At one time,not until 11o’clock did Li Ming go to bed in attempt to make up for the lost lessons.
I was struck/impressed by the beauty of nature the moment I set foot in the Yunwu Mountains.
I will spare no effort to save my pocket money with the purpose of donating/contriburting to the kids from the poverty-stricken areas.
Some effective measures must be taken by the government to let Beijing’s sky bluer and the water cleaner.