I seem to remember you can use it like that when you're saying you're in a certain type of place. Staan, Zitten and Liggen, right? The only one I remember is Ik zit in de whiskybar. I think it might be Liggen for Straat...?
If a verb ends on the vowel a it pronounces a long sounding a, hence there is no need to write staa. Other than that it depends on what way you look at it, and whatever works best for you to understand when and how to apply the rules.