"go on vacation" means that that is what you are doing - vacationing (as opposed to working or whatever).
"go on a vacation" makes the vacation an entity (like an object) - you have gone, you will be away for some time, and then you will come back. (However, it could mean, particularly, that there is a some particular tourist trip organised by a travel agent, or that one had been wanting to visit (say) Spain and had gone to Spain, or whatever… and it was a vacation.)
It is not that either is incorrect.
The correct grammar for the sentence is: "During your vacation, did you stay in the hotel?"
No, the correct grammar is: "June will be ending soon."
No, "is go with" is not correct grammar. The correct structure would be "go with" without the word "is." For example: "The red shoes go with the blue dress."
No, "will be had" is not a correct grammar. The correct grammar would be "will have."
Do you mean: "Are there ways to correct grammar?" Well yes. You see, it's sort of like grading. If someone says something or their grammar incorrect, and you correct them, you are like sort of correcting their grammar and this is the only way to answer your question so.
No, it is correct grammar, not a correct grammar.
The correct grammar is: "Are those correct?"
The one that is NOT a sentence fragment and uses correct sentence grammar is:He liked to go fishing.
"On a train" is correct grammar.
no_____If the sentence is You do do that (meaning You are in the habit of doing that) the grammar is perfectly correct and the sentence 'does have correct grammar'.
No. The correct way to say this is, "I didn't go on the website."
No, the correct grammar would be: "July has just started."