Read the sentence below then classify the underlined phrases Gerund, Infinitive and Participle

1. I enjoy COLLECTING OLD COINS
2. As a reporter she had TO VERIFY HIS STORY
3. The insulin USED FOR THE TREATMENT OF DIABETES is taken from pigs and cows
4. A snake is unable TO CLOSE IT'S EYES
5. Dad was surprised at me ENTERING THE POETRY CONTEST​