21、For the past + 时间，S + 现在完成式……
(过去……年来，……一直……)
例句：For the past two years,I have been busy preparing for the examination.
过去两年来，我一直忙着准备考试。
22、Since + S + 过去式，S + 现在完成式
例句：Since he went to senior high school， he has worked very hard.
自从他上高中，他一直很用功。
例句：We cannot emphasize the importance of protecting our eyes too much.
我们再怎么强调保护眼睛的重要性也不为过。
4、There is no denying that + S + V ……
(不可否认的……)
例句：There is no denying that the qualities of our living have gone from bad to worse.
不可否认的，我们的生活品质已经每况愈下。
5、It is universally acknowledged that + 句子
(全世界都知道……)
例句：It is universally acknowledged that trees are indispensable to us.
全世界都知道树木对我们是不可或缺的。
6、There is no doubt that + 句子
(毫无疑问的……)
例句：There is no doubt that our educational system leaves something to be desired.
毫无疑问的我们的教育制度令人不满意。
7、An advantage of ... is that + 句子
(……的优点是……)
例句：An advantage of using the solar energy is that it won't create (produce) any pollution.
使用太阳能的优点是它不会制造任何污染。
8、The reason why + 句子 ... is that + 句子
(……的原因是……)
例句： The reason why we have to grow trees is that they can provide us with fresh air./
The reason why we have to grow trees is that they can supply fresh air for us.
我们必须种树的原因是它们能供应我们新鲜的空气。
9、So + 形容词 + be + 主词 + that + 句子
(如此……以致于……)
例句：So precious is time that we can't afford to waste it. 时间是如此珍贵，我们经不起浪费它。
10、Adj + as + Subject(主词)+ be， S + V...
(虽然……)
例句：Rich as our country is， the qualities of our living are by no means satisfactory.