Pessoal podemos conhecer a estrutura da oração e classificar:
Zero Conditional - if + simple present + simple present.
Ex: If you eat a lot, you become fat.
First Conditional - if + simple past + simple future.
Ex: If I had enough money, I will buy this house.
Second Conditional - if + simple past + woud/could/might + infinitive (sem o 'to')
Ex: If I had enough money, I would like travel abroad.
Third Conditional - if + simple past + woud/could/might + have + past participle
Ex: I would have travelled abroad if I had much money.
Gabarito:
b) I would have been in trouble if Jane hadn’t helped me.
Está na Third Conditional.
b-
The second conditional is used for unlikely occurrances and the possible effects thereof. The takes the form of if + simple past, would + infinitive
zero conditional - for real facts: if the economy improves, people will spend more.
1st conditional - likely future scenarios: if you learn the rules, you'll play the game better
2nd conditional - unlikely/imaginary situations: if I were rich, I would
3rd conditional - hypothetical situations in the past: if I had had the time, I would have stayed home
2nd conditional é equivalente ao pretérito imperfeito do modo subjuntivo. Indica possíveis ações resultantes de algo que é pouco provável ocorrer. Usado para especulações.