Identify the parts of a simple sentence that represent 'What's happening?', 'Who or what is involved?' and the surrounding circumstances (ACELA1451)

1. See Spike Run - Identify subject
2. Who to Whom? - Identify subject/object
3. Ian is skiing skilfully - Subject of sentence
4. Jen sings and skips - Subject of sentence
5. Who To Whom? - Identify subject/object