National относится к одной стране, только к народу одной страны. International подразумевает две страны и более
I come out of the house and go straight along the pavement, then turn left and keep going on. After that I turn left once again, сross the road, go straight and some time later turn right.
Lets go to Happy Birthday!
Go on Happy Birthday!
Go on Holyday!
Where were they standing when you saw them?
два действия в прошлом, первое в развитии