1.All of the balloons on the string (popped) except two.
2.Do you (want) to buy those books?
3.Daniel's dog is (following) the trail to the river's edge.
4.For thirty years the noon whistle has (blown)exactly on time.
5.The players have (challenged) their parents to a game of soccer.
I have to tell is the verb form in () is base form, present particle, past, or past particle