1. SECOND CONDITIONAL
1.1. Structure
1.1.1. if+past simple (were),present conditional (would+verb)
1.2. Use
1.2.1. Imaginary situations in the present or future
1.3. Examples
1.3.1. If I met a celebrity I would take a picture with her/him
1.3.2. If today stop raining I would start doing sport
1.3.3. If i were you I would start doing sport
2. ZERO CONDITIONAL
2.1. Examples
2.1.1. I get tires if I work too much.
2.1.2. If you drop an object, it falls.
2.1.3. If someone shoots you in the head, you die.
2.1.4. If you heat water at 100 degrees, it boils.
2.2. Strucure
2.2.1. If
2.2.1.1. Present simple
2.2.1.1.1. , ...
2.3. Uses
2.3.1. To talk about things that are always true.
2.3.1.1. Like a scientific fact.
3. FIRST CONDITIONAL
3.1. Structure
3.1.1. If+present perfect+will/won+infinitive
3.2. Uses
3.2.1. To talk about possibilities in the present or in the future
3.3. Examples
3.3.1. If I miss the bus, I'll be late
3.3.2. If I don't get the tickets, I won't go to the concert
3.3.3. If I get some money, I'll start travelling
4. PAST PERFECT
4.1. Structure
4.1.1. Had (not)
4.1.1.1. Past participle+
4.2. Uses
4.2.1. Meaning clear
4.2.1.1. He wet himself, because he had drunk a lot of Monster.
4.2.2. An event before another event in the past
4.2.2.1. Someone opened my box and took my capibara. Then, I opened my box and I discovered that someone had taken my capibara.
4.2.3. Consecuence
4.2.3.1. She died, because she had been stung by a parrot.
4.3. P. Perfect Vs P. Simple
4.3.1. Past Perfect
4.3.1.1. He missed the bus, because he had overslept.
4.3.1.2. We make emphasis that something happen before.
4.3.2. Past Simple
4.3.2.1. He missed the bus
4.3.2.2. We talk about an action that it's finished