1.No, because the lawn of the park is far from my home. It will take too much time to go to the park.
2.Yes, we feel it save much water after conduct the saving-water activity. (S/V配合; prep. + N/V-ing; N-ed (被動) / N-Ving (主動)
3.No, S + V because the weather is so hot that we took a shower many times.
4.Yes, it is too easy for us to follow.
5.No, because we are too lazy to use the water which has been used to wash rice to water the trees and plants.