1. "On vacation" is an adjective phrase describing Susan's current state. "Go on vacation" is a verb phrase. They're different parts of speech, which makes it difficult to compare them in any meaningful way. Perhaps some similar example pairs will make it clearer: "on vacation" is a prepositional phrase - it is headed by a preposition. @JamesK.. The two sentences mean the same thing. 'On a vacation' is used more commonly than 'for a vacation'. One very minor difference between the two phrases, which does not apply in this case is : 1/ If I said, "I am going to Spain on my vacation", there is a possibility that I may also go somewhere else as well. 2/ If I said, "I am going to Spain for.

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i am on vacation. This phrase is correct and commonly used in English. This phrase is used to indicate that someone is currently taking time off work or school for leisure or travel. Examples: I am on vacation in Hawaii. She is on vacation with her family. He is on vacation for two weeks. They are on vacation in Europe.. In Vacation. Using the preposition 'in' with 'vacation' is not a common or correct usage in English. The preposition 'in' is used to indicate that something is located inside a particular place, or within a specific period of time. Nevertheless, 'vacation' is not a physical location or a period of time that can be contained within something else.