Simple present and simple future

Presente simple y futuro simple

Uno de los usos del presente simple es para hablar de acciones futuras que han sido planeadas o forman parte de una rutina. Sin embargo:

 1  Se prefiere el uso del 'presente simple' cuando los hechos o acciones forman parte de un programa o son inalterables.

The sun rises at 6.15 tomorrow.

El sol sale mañana a las 6:15.

My plane is at two o´clock.

Mi vuelo es a las 2.

Cuando los planes son menos formales o no forman parte de una rutina no se suele usar el 'presente simple' sino 'will', el presente continuo o 'be going to'.

I will go to the cinema tomorrow.

Iré al cine mañana (lo acabo de decidir)

I´m seeing Susan tonight.

Voy a ver a Susan esta noche (está planeado)

It´s going to rain.

Va a llover (hay evidencias).

 2  En las oraciones subordinadas introducidas por 'as soon as', 'after', 'before', 'when', 'until', 'till', 'by the time', 'while' referidas a una acción futura se usa el presente simple y no 'will'.

He is going to buy a Porsche when he retires.

Él se va a comprar un Porsche cuando se jubile.

Will you stay here until he leaves?

¿Estarás aquí hasta que se vaya?

By the time you read this letter I should be in Paris.

Para cuando leas esta carta podría estar en París.

 3  En las condicionales introducidas por 'if', 'in case', 'provided', 'unless' también se usa el presente simple.

Provided you make the dinner I´ll clean the house.

Siempre y cuando hagas la cena limpiaré la casa.

Unless you lend me some money I won´t be able to pay it.

A no ser que me prestes dinero no seré capaz de pagarlo.

Ejercicios

Escribe el verbo en presente o futuro, según corresponda.

1 He need the money on the 15th.

He'll need / will need the money on the 15th.

2 His train arrive at 6 o´clock.

His train arrives at 6 o'clock.

3 I not move until you tell .

I'll not move/will not move/won't move until you arrive.

4 You / not finish reading that book this week?

Won´t you finish / Will you not finish reading that book this week?

5 The exhibition start tomorrow.

The exhibition starts tomorrow.

6 If you do it, I be there.

If you do it, I'll be / will be there.

7 He come as soon as he know you're here.

He'll come / He will come as soon as he knows you're here.

8 My mother move to my sister´s house when she have the baby.

My mother will move to my sister's house when she has the baby.

9 By this time tomorrow my grandfather be back from the hospital.

By this time tomorrow my grandfather will be back from the hospital.

10 Unless you finish your homework, I let you play the new game computer.

Unless you finish your homework, I'll not let/won't let/shan't let you play the new game computer.