What time did you arrive at class?
What time did you arrive to class?
I looked up a grammar question and the top "at" sentence is what one of the users wrote in the comments. I think the first sentence is right but it sounds weird when I say it so I'm not sure. Grammarly's telling me to change the prepositions "at" and "to" to "in"! Is it right?
What time did you arrive at the store?
What time did you arrive to the store?
"At the store" sounds right to me, and even Grammarly's saying to change "to" in the 2nd sentence to "at" but what's the difference between this one and the classroom one? Why do I have to put "in" for class but for the store it's optional?