1. Peter goes to his office every day except Sunday. On Sundays he stay at home and works in the garden.
2. We arrived at the airport in good time for the plane.
In example 1, I think Peter cannot inside the garden. why don't use at the garden? (a certain point)-- He is indeed 'inside' the garden. 'In' applies to 2 dimensions as well as 3: he is within the boundaries o