Use Conditional 1 or Conditional2
1.If I (have) time now, I ( help) you
2. If I (be) in the USA, I (go) to the Disneyland Park
3.If I (be) you, I (go) tothe USA to see my uncle
4. If we (live) in Mexico, we (speak) Spanish
5. If I (have) time yesterday, I ( help) you

1. have, will help2. were, would go3. were, would go4. lived, would speak5. had had, would have helped (здесь уже третий тип)