The Future Tense:

This tense is formed by adding:

• é
• ás
• á
• emos
• éis
• án

to the end of the infinitive. Most of the verbs that are irregular in the future tense modify the stem but leave the endings the same as above.

The future tense is often used in discussing things that will happen. It frequently becomes the equivalent of the English "will" followed by the verb:

• Tendré tres hijos.

I will have three children. 

• Nadará mañana.

She will swim tomorrow.

But, the future tense is not used to express a willingness to do something. For this, use the verb "querer":

• ¿Quieres ir a la tienda?

Will you go to the store?

For actions that will occur in the near future, the present tense is more commonly used:

• Esta noche voy al cine.

Tonight I'm going to the movies.

Further in the future, use the future tense:

• El año que viene iré a España.

Next year I'm going to Spain.

The future tense of Spanish also has two other common uses: The "suppositional future" — The future tense can be used to indicate likelihood or probability. The translation will depend on the context; in question form, it can indicate uncertainty:

• Serán las nueve.

It's probably 9 o'clock.

• Tendrás hambre.

You must be hungry.

• ¿Qué horas serán?

I wonder what time it is.

• Estará enferma.

She's most likely sick.

Emphatic command — As in English, the future tense can be used to indicate an intense demand:

• Comerás la espinaca.

You WILL eat the spinach. 

• Saldrás a las nueve.

You WILL leave at 9.