questions rules

By matsas, in Constantinopolis

1) when you build a red tile(production building) you put immediately the goods that produce the building or you have to wait the next produce goods phase?

2)can you use a good that you bought from the market for the activation of the commercial buildings(yellow buildings) or at the donate goods phase ?

3) can you activate commercial buildings both at the construct building phase and at the accept contract phase ?

4) the green buildings used once per round correct?