Spanish modal verbs: When and how to use them?

• Obligation

  Use deber in the simple present to express obligation. In this case, it’s close in meaning to “must” in English:

  Debes respetar las reglas de la clase. (meaning You must respect the rules of the class.)

• Advice

  It is also possible to use it in the Spanish conditional simple to give friendly advice. This is similar to “should” or “ought to”:

  Debes respetar las reglas de la clase. (meaning You must respect the rules of the class.)

  When giving advice that refers to the recent or remote past, use the preterite form of the verb deber:

  Debiste estudiar más para el examen. (meaning You should have studied more for the test.)

Deber can also be used with the preposition de but, in that case, it expresses something different. We’ll cover that below, so stick around!

If you use the verb deber in the negative form, the meaning changes. In this case, it’s used to say that something is not convenient, not recommended, or reproachable:

• Permission

  Use poder in the present as an equivalent of “may” to ask for permission in a polite way:

  ¿Puedo entrar a su clase, profesora? (meaning May I enter your class, professor?)

• Polite requests

  Poder is also useful in the conditional form to ask for something politely. In this case, it’s close in meaning to “could”:

  ¿Me podría traer la cuenta? (meaning Could you bring me the bill?)

• Ability

  Use poder to talk about abilities and skills:

  Emiliano puede hablar 5 idiomas. (meaning Emiliano can speak 5 languages.)

• Possibility

  In this case, poder is very similar to the verbs “may” and “could” in English. You can use the imperfect or the conditional:

  Podías / podrías haber salido temprano. (meaning You could have left early.)

  To express a remote possibility, use poder in the conditional form. In this sense, it’s more similar to “might” or “could” in English:

  Si todo sale bien, yo podría viajar a España en dos meses.

  Translation: If everything goes well, I might/could travel to Spain in two months.

• Speculation

  To speculate about something just like with English “could,” you can use poder in the present or the conditional mood:

  Puede / podría ser mi hermano.

  Translation: It could be my brother.

If you use the verb poder in the negative form, you’re expressing prohibition, lack of permission, or lack of ability:

In the preterite, the negative form expresses an unsuccessful attempt at doing something:

• Will/Desires

  Use querer (meaning to want) as a modal verb to indicate will.

  Queremos viajar por todo el mundo. (meaning We want to travel the world.)

  Querer used in the imperfect subjunctive expresses wishes:

  Ana y Carlos quisieran estar en la playa ahora mismo.

  Translation: Ana and Carlos wish they were on the beach right now.

• Invitations

  Querer is often used in questions to make invitations:

  ¿Quieres ir al parque conmigo? (meaning Do you want to go to the park with me?)

• Attempt

  Depending on the context, querer in the preterite can mean that you tried to do something but failed at it:

  ¿Quise levantarme temprano. (meaning I tried to get up early.)

In the negative form, no querer indicates lack of will:

And in the negative preterite it indicates that you refused to do something:

The verb saber (meaning to know) introduces knowledge or ability. If you use it in the negative form, it means lack of knowledge or ability. Use it when you want to say you know how to perform a skill:

The verb soler is used in Spanish to indicate a habit or lack of habit. My students often ask me for the English equivalent. The closest verbs I’ve found to mean soler in English are: “to be accustomed to,” “to tend to,” or “to be used to.”

The verb deber along with the preposition de is used if we want to express deduction in both affirmative and negative sentences. The meanings in English change a bit: in the affirmative, deber de is closest in meaning to “must,” but in the negative form, it means “can’t” (as in the meaning of being impossible).

This one is really useful and it can also express different things: obligation or need, advice, and deduction! You always need to use it with the conjunction and a verb in the infinitive que and a verb in the infinitive. Let’s see the different cases where it can be used:

• Obligation or need

  Use tener que (meaning have to) + infinitive to indicate that an action is mandatory or necessary.

  Mañana es el examen final. Tengo que estudiar mucho.

  Translation: Tomorrow is the final exam. I have to study a lot.

  For more on how to express obligation in Spanish, click the link!

The verb haber (meaning to have) works differently than other verbs because when used as a modal with que it only uses the third person singular: había (imperfect) , habría (conditional) etc., or in the present use the fixed form hay. This verb combination is very useful to express obligation or need, and is close in meaning to deber. Some students confuse it with tener que, but there's a difference. Haber que + infinitive is always used to make impersonal sentences, meaning that the actions expressed with it are addressed to a general audience:

Let’s compare haber que with tener que:

As you can see, haber que doesn’t address who has the obligation to do the action, whereas tener que addresses a specific person(s).

Finally, this combo in the present tense can also be used to suggest to do something, similar to English “let’s”:

To learn about other impersonal expressions such as the impersonal se in Spanish, click the link!

The verb necesitar (meaning to need) is also a very useful one. Its meaning and use in Spanish is quite similar with English: it expresses need, necessity, or lack of necessity.

Some students overuse necesitar to talk about obligation instead of using tener que (meaning have to), and there is a slight difference in Spanish: necesitar is used to talk about personal needs, whereas tener que is used to talk about obligations that are defined by other circumstances. For example: