Por vs para has one reliable test and it takes three seconds. Run the blank through the chart below, then take the twenty sentences underneath it.
The first question does most of the work. "Estudio español para hablar con mi suegra" survives the swap to "in order to talk to my mother-in-law", so it is para; "llegó tarde por el tráfico" does not, because "in order to the traffic" is nonsense, so it is por. The second question catches the three cases where para is not a purpose at all: a deadline (para el lunes), a destination (salimos para Mérida) and a recipient (este regalo es para ti). Everything left over is por, and the list of things that end up there is longer than the list that does not.
Every use, with a line you would actually hear
The table is the long version of the chart. Read the middle column if you are choosing, and the right column if you want to hear what it sounds like.
| What the blank is doing | Word | A line you would hear in Mexico |
|---|---|---|
| The reason something happened | por | Llegó tarde por el tráfico |
| Thanks for something | por | Gracias por el café |
| A price or a swap | por | Lo compré por doscientos pesos |
| Per, as in per day | por | Trabajo ocho horas por día |
| Through or around a place | por | Caminamos por el centro |
| How long something lasted | por | Estuve en Oaxaca por tres semanas |
| The means or the channel | por | Te llamo por teléfono |
| In place of somebody | por | Firmé por mi jefe |
| Who did it, in a passive sentence | por | El mensaje fue enviado por mi hermana |
| Why, as a question | por | ¿Por qué no me dijiste? |
| A purpose, with a verb after it | para | Estudio español para hablar con ella |
| Who something is for | para | Este regalo es para ti |
| Where you are heading | para | Salimos para Mérida el viernes |
| A deadline | para | Necesito el recibo para el lunes |
| Whose opinion it is | para | Para mí, la mejor está en la esquina |
| Measured against expectation | para | Habla muy bien para ser principiante |
| What a thing is used for | para | Esta salsa es para los tacos |
Ten rows of por against seven of para, which is the shape of the real distribution: por is the busier word and the safer guess when you are stuck mid-sentence. The row worth memorising on its own is the last por row — "por qué" in two words is the question "why", while "para qué" is "what for", and they are different questions that get different answers. The rest of the table is best read once and then met again in the drill below, because a list of seventeen uses is not something anybody recalls at a taco stand.
Twenty sentences, marked as you go
Nothing is recorded and nothing is sent anywhere. Close the page and the score is gone.
Question 1 of 20 · 0 right so far
Gracias ____ el café.
Pick one to see the rule.
Every sentence is one somebody in Mexico would actually say, and each one has exactly one natural answer in the situation its English line describes — the genuinely ambiguous pairs are in the section below instead, because a drill that marks one of those wrong would be teaching a rule that does not exist. Pick a word and the rule appears immediately, which is the point: you are not being tested, you are being corrected twenty times in four minutes. Getting sixteen right is roughly where this stops being a thing you think about.
The four pairs where both words are correct
This is what makes por and para feel unlearnable, and it is the part the tables skip. In each pair, both sentences are good Spanish and they mean different things.
Lo hice por ti is "I did it because of you", for your sake, moved by you. Lo hice para ti is "I made it for you to have". One is a motive, the other is a recipient.
Trabajo por mi hermano means you are covering his shift. Trabajo para mi hermano means he is your boss.
¿Por qué? is "why", asking for a cause. ¿Para qué? is "what for", asking about a purpose, and in Mexico it can carry an edge — ¿para qué? sometimes means "and what exactly is the point of that?"
Vengo por el paquete is "I have come to collect the package". Vengo para el paquete is not something anybody says; when the verb is one of fetching, Spanish uses por, and this is the one place where the "in order to" test misleads an English speaker.
Por and para before an infinitive both exist. Para plus a verb is the purpose ("para hablar"). Por plus a verb is the cause ("por hablar tanto, perdió la voz" — from talking so much, he lost his voice). If the second half explains a consequence of the first, it is por.
What to say when you are stuck
Guess por. Ten of the seventeen uses above are por, most real sentences that stall are causes or prices rather than purposes, and a wrong por sounds like a small accent error rather than a broken sentence.
Then keep talking. A Mexican listener repairs the preposition without noticing, the way you repair "he don't" without noticing. The only two prepositions in this language that genuinely stop a conversation are the ones that change the noun, not these.
Where the lessons on this site fit
The two other pairs that stall learners at the same point are ser vs estar and preterite vs imperfect, both written to this page's shape with a drill of their own.
Por and para run through the whole Grammar deck rather than sitting in one lesson, which is how they actually come at you. Speak is where you meet them inside a dialogue with a reply attached, which is the format that eventually makes the choice automatic.
Key takeaways
- The test is "could you say in order to". Yes means para, and it settles most sentences in about three seconds.
- Para also covers a deadline, a destination and a recipient, none of which is a purpose. Those three are the exceptions worth memorising.
- Everything else is por: the cause, the price, the swap, the route, the duration, the means, the per, the passive agent.
- Ten of the seventeen uses are por. When you are stuck mid-sentence, guess por.
- Por qué is why and para qué is what for. Two words, two different questions.
- Four pairs take both words with different meanings, led by "lo hice por ti" against "lo hice para ti". Those are not mistakes to avoid, they are two things to be able to say.
- A wrong preposition never breaks a sentence. Keep talking.