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.
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...）