Réponse :
Bonjour,
1) If we were (be) in London Park today, we would be (be) able to go to the concert in Hyde Park.
2) if I won (win) the lottery I would buy (buy) a big house.
3) if I had (have) million dollars I would give (give) a lot to sharity.
4) if my sister had (have) a degree she would love (love) working on animal conservation
5) my parents wouldn't drive (not/drive) if public transport were (be) reliable.
Explications :
Second Conditional
Tu repères la partie de la phrase ave "if" ==> tu mets au prétérit
L'autre partie ( la subordonnée ) tu utilises : would + base verbale