一、~~~ the + ~ est + 名词+ (that) + 主词+ haveever + seen ( known/heard/had/read, etc)
~~~ the most + 形容词+ 名词+ (that) + 主词+ have ever + seen ( known/heard/had/read, etc)
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
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。)
We cannot emphasize the importance of protecting our eyes too much.
四、There is no denying that + S + V ...(不可否认的...)
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...)
It is universally acknowledged that trees are indispensable to us.
六、There is no doubt that + 句子~~ (毫无疑问的...)
There is no doubt that our educational system leaves something to be desired.