Ya signals a change that has already occurred or a limit that has already been reached. Aún and todavía signal continuity, a wait, or a situation that remains the same. With ya, the speaker looks at the result: it has already arrived, it is already ready, it has already finished. With aún and todavía, they look at what is still in progress or what is still missing: it is still here, it has not started yet, there is still time.

Use ya when a new situation replaces the previous one. The form usually appears with a verb in the past or present to show that the change already counts at the current moment: I already live in Madrid, I already understood the explanation, They already have the answer. In these cases, what matters is not the action itself, but the new state that remains after that action.

Use of ya for changes currently in effect

Usage	Explanation
Change of state	ya is used when a situation has changed and the new state is considered current.
Completed action	ya is used to indicate that an action has ended and is no longer pending.
Beginning of a new reality	ya is used when a previous situation ceased to be valid and another one begins.

With negation, ya no means that something stopped occurring. The structure is clear: ya no + verb. They no longer work here, it is no longer cold, we no longer use that door. The idea is one of an end, rupture, or loss of continuity. It does not express mere absence; it expresses that it did occur before and has now ended.

Aún and todavía mark that a situation remains in effect, unchanged up to the present moment. They usually appear with verbs that describe permanence or development: they still live there, they are still studying, the store is still open. They can also accompany an idea of slow progress: it is still being cooked, the train has not arrived yet. In conversation, todavía is the most common form, but aún works the same way when one wants to give a more formal or more emphatic tone.

Use of aún and todavía for continuity

Usage	Explanation
Situation that remains the same	aún or todavía is used when a situation continues without change up to now.
Process in progress	aún and todavía are used to say that something continues developing and has not ended.
Persistence of a condition	aún and todavía are used when a condition is still present at the current moment.

When something expected is still pending, aún no or todavía no is used. The structure expresses a wait that has not been fulfilled: it has not arrived yet, they have not eaten yet, it is not ready yet. The verb remains in the present because the situation is still open at the moment of speaking. These forms do not deny the future; they only indicate that the expected change has not happened yet.

Ya can also intensify an immediate action. In this use, it is close to right now or at this moment: I am going now, leave now, I will do it right away. In responses and decisions, ya reinforces the idea of closure or confirmation: Yes, now, that's it, I understand now. In commands, it conveys urgency: come now, speak now, leave it now. The tone depends on the context, but it always signals immediacy or resolution.

Aun without an accent mark means even and completely changes the meaning. It does not express time, but rather inclusion or emphasis: Even the youngest were tired, even with rain we went out, even so, they continued. In these cases, aun is equivalent to even or up to. The accented form, aún, retains the meaning of time and can be replaced by todavía in most contexts.

Difference between aún and aun

Idea
aún is written with an accent mark when it means todavía.
aun is written without an accent mark when it means even.
The accent mark helps avoid confusing the meaning of the sentence.

In everyday conversation, todavía usually sounds more natural and more frequent than aún. That is why phrases such as not yet, it is still, there is still appear very frequently. Aún appears more in texts, in more polished sentences, or when one seeks to give more force to the idea: it still persists, it has not ended yet, there is still hope. Both forms are correct, but the tone changes with the choice.

todavíaaúntodavía

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Puede sonar más enfático o más formal según el contextoEs muy común en el habla diaria y suele percibirse como la opción más espontáneaSuele sonar más natural en la conversación cotidiana y en muchos contextos neutros

Usage preferences between todavía and aún

Region	Variant	Definition	Example
Spain	todavía	It usually sounds more natural in everyday conversation and in many neutral contexts.	Todavía no he cenado.Todavía I have not had dinner.
Mexico	todavía	It is very common in daily speech and is usually perceived as the more spontaneous option.	Todavía estamos en camino.Todavía we are on our way.
Argentina	aún	It may sound more emphatic or more formal depending on the context.	Aún no sé qué voy a hacer.Aún I do not know what I am going to do.

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