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.
例句：We cannot emphasize the importance of protecting our eyes too much.