Gerund or Participle

  • Hello!

    Could you tell me please whether the words in parentheses are gerunds or participles?
    Or they might be both participles and gerunds? I think they might be both.

    I’m busy (refurnishing) my room, don’t call me this weekend.
    It’s no use (crying) over spilt milk.
    It’s no good (calling) him, he’s abroad.
    I had trouble (starting) my car this morning.
    I had a hard time (understanding) what he was saying.
    Geoffrey spent the whole weekend (working) in the garden.
    I don’t want to feel that I wasted my youth (being) good and responsible when I should have been bad and rebellious.

  • refurnishing-GERUND
    Остальные-PARTICIPLE I