Do I always have to use the subject pronoun like yo or tú?

No, Spanish is a pro-drop language. Because the verb ending usually tells you exactly who the subject is, you can drop pronouns like yo or tú unless you need to emphasize them or clear up ambiguity.

What happens if a verb is irregular?

Irregular verbs do not strictly follow these predictable rules. They might have spelling changes in their stems or completely unique endings. You will need to memorize the patterns for common irregular verbs like ser or tener separately.

Do I need to learn the vosotros form?

The vosotros form (you all, informal) is primarily used in Spain. If you are learning Latin American Spanish, you will use ustedes instead for the plural you, which takes the exact same verb endings as ellos and ellas.

How do you conjugate regular verbs in the present tense?

Conjugating regular verbs in the present tense in Spanish involves two simple steps: dropping the infinitive ending (-ar, -er, or -ir) to find the stem, and adding a new ending that matches the subject (who is doing the action). It is like customizing a generic uniform. You take the basic, blank shirt (the verb stem) and iron on a specific patch (the ending) so everyone knows exactly who it belongs to. By swapping the ending, you instantly tell the listener who is performing the action without even needing to say their name.

Finding the Verb Stem

Every Spanish verb in its basic, un-conjugated dictionary form is called an infinitive. Regular infinitives always end in one of three ways: -ar, -er, or -ir (like hablar, comer, or vivir). To conjugate a verb, your first step is to chop off that two-letter ending. What you are left with is called the stem. For example, dropping the -ar from hablar gives you the stem habl-. This stem holds the core meaning of the verb.

Choosing the Right Ending

Once you have your stem, you add a new ending based on who is doing the action (the subject) and what type of verb it is (-ar, -er, or -ir). For -ar verbs, the endings are -o (yo), -as (tú), -a (él/ella/usted), -amos (nosotros), -áis (vosotros), and -an (ellos/ellas/ustedes). For -er verbs, the endings are -o, -es, -e, -emos, -éis, -en. Finally, for -ir verbs, the endings are very similar to -er verbs: -o, -es, -e, -imos, -ís, -en.

Where Students Slip Up

A common mistake is confusing the endings for -er and -ir verbs, especially in the nosotros and vosotros forms. Remember that while they share most endings (like -o, -es, -e, and -en), the nosotros form for an -er verb is -emos, but for an -ir verb it is -imos. Another slip-up is forgetting to drop the infinitive ending before adding the new one, resulting in a clunky, incorrect word like hablaramos instead of hablamos.

Worked through

Conjugate the regular verb escribir (to write) in the present tense for the subject nosotros (we).

Step 1: Identify the infinitive ending. The verb escribir is an -ir verb. Step 2: Find the stem by dropping the -ir. This leaves us with escrib-. Step 3: Find the correct ending for the subject nosotros for an -ir verb. That ending is -imos. Step 4: Attach the ending to the stem. escrib- + -imos = escribimos (we write).

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Where this comes from: OpenStax: Introductory Spanish I · Practice Makes Perfect: Spanish Verb Tenses · Khan Academy: Spanish Grammar Unit