文法錯誤?

不可用very來形容「動詞」miss。應用very much,即是 I will miss the holiday very much.

例如: I very like XX. 文法上是錯,因like是動詞。應是I like xx very much.

very 通常與形容詞,副詞連用,例如: She is very beautiful. You played very well.

Most cases, we will just say " I miss the holiday very much" or I will very much miss the holiday" The latter is more conversational.

Honest to you even your sentence is grammatical wrong, but I bet more foreigner will catch your meaning.

其實你心中已經會永遠想念這個假期, 所以可用現在式來表達; 不必用將來式
I miss .....
在句子中, 相信你想表示十分想念這個假期, 但未能表達出來, 故可用 very much 這個副詞. 通常副詞可放於句末.
I miss the holiday very much.

你這句當然是文化錯誤，因為雖然ｖｅｒｙ可作副詞用，但它只以修飾adjective，adverb，participle等，而不可以直接修飾動詞
所以你這句只可以說成
I will miss the holiday very much.

will 不是 動詞, miss 不是 形容詞, 全句冇動詞.

而且 句子意思是 將會一直懷念假期, 並非 將會開始懷念假期. 所以應改為

I will be missing the holiday very much.

very唔好放呢個位//
放最後變成very much會自然D
i.e., I will miss the holiday very much.

It is wrong.

It should be
"I will miss the holidays very much."