有無grammer mistake

有錯, 有少少sentence structure問題
第一句應該係 the coldest winter I ever had in my life
個ever 係 adverb, 用黎modify verb, adj 或者其他advberb, 所以應該放係個subject 既後面, verb 既前面
你可以話 it's the coldest winter ever, 但係有 I had, 就唔可以話 the coldest winter ever I had, 要講 I ever had
第2句....唔知你句句子係唔係full sentence?? 點解成句都冇verb既???

除非你己離開了人世（大吉利事），否則用“I had in my life”是錯的。因為你的生命仍在延續中，所以當你說過去的或直到目前的事情，你要用present perfect tense，亦即是: I have ever had in my life.
This is the coldest winter that I have ever had in my life.

（若果你是寫過去式：This was the coldest winter that I had ever had in my life.)

又或者，可以簡潔一點寫成：
This is the coldest winter in my life.

因為ever有「至今」的意思，而in my life就是你的生命裡，當然也存有「至今」，所以若沒有了動詞，你不該把ever和in my life一同使用，除非你想很強調這是你「今生今世中最寒冷的一個冬天」。

無 but i do not know what is ''eitehr '' do you type the wrong word?