I want to ask to my boss that I want to go to vacation, because I'm very tired. How I can say it correctly to my boss. It's my version:
I'm very tired. I haven't gone to vacation a long time. There is need to me to go to vacation.
I'm very tired.
This is fine. But it doesn't perfectly convey the idea that you are over-worked. Being tired could just mean you need a day off to get some sleep.
I haven't gone to vacation a long time.
In this case, "gone to" is incorrect. You don't go TO a vacation, you go ON a vacation.
I would phrase this one of two ways (both are fine):
I haven't gone on a vacation in a long time.
I haven't been on vacation in a long time.
There is need to me to go to vacation.
This one is a little confusing. First, what's wrong:
There is need to me -> this isn't grammatical.
Same issue as before with go to vacation.
Here is a grammatical version of that sentence.
But it sounds a little odd to say it that way, so I would have just said:
So, here is how I would phrase this to my boss in a somewhat formal office setting. (Assume I am speaking this sentence, not writing it)
<Boss's last name>. I've been working very hard lately, and haven't taken a vacation in a long time. I need to go on one soon.