Question

Select the gerund phrase in the sentence below. Then determine the noun function of the gerund.
1.Water skiing, sailing, and swimming are my favorite summer sports.
2.She is successful in mimicking others' voices.
3.Writing a research paper sounds difficult.
4.He must like studying calculus.
5.I enjoy playing the piano.
6.Her favorite pastime is entertaining friends.
7.Brett earns his income by repairing cars.