what is the Gerund phrase and Noun function in these sentences?

Question

1)Writing a research paper sounds difficult.
2)He must like studying calculus.
3)Her favorite pastime is entertaining friends.
4)Water skiing, sailing, and swimming are my favorite summer sports.
5)I enjoy playing the piano.
6)She is successful in mimicking others' voices.
7)Writing a research paper sounds difficult

Answer 1

Jason/Cody -- please do not keep posting the same question.

http://www.jiskha.com/display.cgi?id=1333492372

Answer 2

Gerund phrase:
she is successful
mimicking other's voices
successful in mimicking

Noun function:
object of the preposition
predicate noun
direct object
subject