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Conditionals have been a fundamental part of English grammar since its inception. In the Middle Ages, conditionals were simpler, but over time, the three structures we know today developed: zero, first, and second conditionals.

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| Condicional | Estructura | Ejemplo |

| Zero Conditional | If + Present Simple, Present Simple | If you touch fire, you get burned. |

| First Conditional | If + Present Simple, Will + Verb | If you study, you will pass. |

| Second Conditional | If + Past Simple, Would + Verb | If I had a million dollars, I would buy a house. |

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| Condicional | Estructura | Ejemplo |

| Zero Conditional | If + Present Simple, Present Simple | If you touch fire, you get burned. |

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| Condicional | Estructura | Ejemplo |

| First Conditional | If + Present Simple, Will + Verb | If you study, you will pass. |

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| Condicional | Estructura | Ejemplo |

| Second Conditional | If + Past Simple, Would + Verb | If I had a million dollars, I would buy a house. |

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| Adverbio | Uso | Ejemplo |

| Recently | Para hechos recientes. | I have recently moved to a new city. |

| Lately | Para acciones que han estado pasando últimamente. | Lately, I have been very busy. |

| Ever | Para preguntar sobre experiencias en la vida. | Have you ever been to New York? |

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| Adverbio | Uso | Ejemplo |

| Yet | Para acciones que todavía no han ocurrido (en preguntas y negativas). | Have you finished your homework yet? |

| Already | Para acciones que ocurrieron antes de lo esperado. | I have already eaten. |

| Just | Para acciones que ocurrieron hace muy poco. | She has just left. |

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Adverbs of time such as yet, already, ever, and others have been used in English since the 16th century to express actions at different times, such as the present, past, and future.

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- Zero Conditional:

- Piensa en hechos que siempre son ciertos (leyes de la naturaleza, hechos científicos).

- Ejemplo: If you freeze water, it becomes ice.

- First Conditional:

- Piensa en situaciones posibles o probables en el futuro.

- Ejemplo: If you study, you will pass the exam.

- Second Conditional:

- Piensa en situaciones hipotéticas o improbables (cosas que no están pasando en este momento).

- Ejemplo: If I won the lottery, I would buy a house.

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- She has already finished her homework.

- He has just arrived at school.

- My brother hasn’t called yet.

- They have recently bought a car.

- Lately, she has been studying very hard.

- Have you ever seen a shooting star?

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- Error 1:

If I would be rich, I would travel the world.

Corrección: If I were rich, I would travel the world.

- Error 2:

If you will go to the party, I will go too.

Corrección: If you go to the party, I will go too.

- Error 3:

I have yet finished my homework.

Corrección: I haven’t finished my homework yet.