一、the+-est+名词+（that）+主词+have ever+seen（known/heard/had/read，etc）;the most+形容词+名词+（that）+主词+have ever+seen（known/heard/had/read，etc）
例句：Helen is the most beautiful girl that I have ever seen.
Mr. Chang is the kindest teacher that I have ever had.
二、Nothing is+-er than to+V Nothing is+more+形容词+than to+V
例句：Nothing is more important than to receive education.
三、-cannot emphasize the importance of - too much.（再怎么强调……的重要性也不为过。）
例句：We cannot emphasize the importance of protecting our eyes too much.
四、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。
五、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.
六、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.