There are 4 types of CONDITIONAL SENTENCES:ZERO TYPE (true evidences and rules) •If you heat water over 180º, it boils •If you eat too much fat, you usually put on weight CONDITION CONSEQUENCE(SEE: You usually put on weight if you eat too much fat) IF + PRES. + PRES. or PRES. + IF + PRES.
FIRST TYPE (real situations which may happen)* If the expedition reaches the Everest today, they will return in a week* Susan will bake a cake for the birthday party if she doesn´t forget IF + PRES. + FUT. (WILL) or FUT. (WILL) + IF + PRES.
SECOND TYPE (unreal or imaginary situations)* If you didn´t study so much, you wouldn´t pass all subjects (so you study hard and you pass)* I would carry a bigger suitcase if I needed it (so I don´t need a bigger suitcase) IF + PAST SIMPLE + WOULD+ V (INF) or WOULD + V (INF) + IF + PAST SIMPLE
THIRD TYPE (situations which didn´t happen in the past)* If you hadn´t been born in Munich, you wouldn´t have spoken German (you were born in Munich, so you speak German)* Mary would have chosen a different dress for the wedding if she had known it was the same as yours (she didn´t know, so she wore the same dress) IF + PAST PERF. + WOULD HAVE + PARTIC. or WOULD HAVE + PARTIC. + IF + PAST PERF.