Dear Ken, There is no difference in meaning and both are correct. We use going to + verb to express a plan or intention. However, with the verb “go” we often say the shorter version, as it sounds more natural. In spoken English it often becomes “ I’m gonna go”. Alternatively, we can use verb +ing with all verbs, but usually when we indicate when in the future it will happen. 👉 I’m going to watch a movie ( general info/ option to say when) I’m watching a movie tonight She’s going to get married ( general info / option to say when) She’s getting married in September Hope that helps 🤓👍

You could use either. Both mean you will go to the city centre. However, most of the time the first sentence (I am going to the city centre tomorrow) would probably be used more commonly since it is shorter and the repetition of 'going to go' could be a bit awkward. Whereas the second sentence (I am going to go to the city centre tomorrow) might be used when the speaker wants to add emphasis.