The simple future places the action at a moment after the present. With tomorrow, later, next year, or after, it marks something that has not yet occurred. It also appears when the speaker is not talking about an immediate plan, but about a future time seen as a complete unit: I will travel in summer, They will arrive in December. In addition to future facts, it expresses predictions, promises, formal decisions, and suppositions.

It is used for actions that the speaker presents as future and certain. The sentence usually includes a temporal marker such as tomorrow, next week, in two days, or soon. The structure is subject + simple future + complement: I will study tomorrow, On Monday we will visit Marta, The train will leave at eight. The main value is the reference to a fact occurring after the present, without needing to use going to + infinitive.

The simple future also serves to guess, calculate, or draw conclusions. In this use, the speaker does not assert a future fact, but expresses an assumption about the present or about what will happen. It appears often in questions and comments such as Where will Luis be?, It will be late, You’ll be cold in that outfit. In these cases, the verb tense adds distance and doubt, not certainty.

With the simple future, the speaker can promise, offer, warn, or announce a decision with a serious or formal tone. I will call you tomorrow sounds like a clear commitment. I’ll help with the report presents an offer. You won’t leave without permission functions as a warning. It is also used for decisions made at the moment, especially in careful registers: I’ll take care of it, I’ll make the reservation right now.

Regular verbs keep the full infinitive and add the future endings: -é, -ás, -á, -emos, -éis, -án. With hablar you form hablaré, hablarás, hablará, hablaremos, hablaréis, hablarán. With trabajar you get trabajaré, trabajarás, trabajará, trabajaremos, trabajaréis, trabajarán. The stem does not change in regular verbs; the ending joins directly to the infinitive.

Verbs in -er and -ir use exactly the same endings as verbs in -ar. The full infinitive receives -é, -ás, -á, -emos, -éis, -án. Thus, comer gives comeré, comerás, comerá, comeremos, comeréis, comerán and vivir gives viviré, vivirás, vivirá, viviremos, viviréis, vivirán. The -er or -ir ending is not removed before adding the future.

Some verbs change the stem before adding the endings of the future. The infinitive loses its full form and a new base appears. Tener becomes tendr-: tendré, tendrás, tendrá, tendremos, tendréis, tendrán. Venir becomes vendr-: vendré, vendrás, venderá, vendremos, vendréis, venderán. Poder becomes podr-: podré, podrás, podrá, podremos, podréis, podrán. The ending remains the same as in regulars.

Other very commonly used verbs also change the root. Salir becomes saldr-: saldré, saldrás, saldrá, saldremos, saldréis, saldrán. Poner becomes pondr-: pondré, pondrás, pondrá, pondremos, pondréis, pondrán. Saber becomes sabr-: sabré, sabrás, sabrá, sabremos, sabréis, sabrán. Valer becomes valdr-: valdré, valdrás, valdrá, valdremos, valdréis, valdrán. Querer becomes querr-: querré, querrás, querrá, querremos, querréis, querrán.

Three very frequent verbs have special forms that are useful to recognize in real sentences. Hacer becomes har-: haré, harás, hará, haremos, haréis, harán. Decir becomes dir-: diré, dirás, dirá, diremos, diréis, dirán. Querer keeps the stem-changing pattern and yields querré, querrás, querrá, querremos, querréis, querrán. In all of them, the future ending remains; the irregularity is in the stem.

Ir a + infinitivo presents a near future, planned, or very probable: I am going to go out now, We are going to dine soon. The simple future sounds more formal, more distant, or more emphatic: I will go out now, We’ll have dinner soon. In predictions, the simple future expresses conjecture or calculation, while going to + infinitive is not used to suppose. When the speaker wants to announce a solemn decision, a promise, or a warning, the simple future feels more natural than going to + infinitive.