costar
to cost
📚 costar is a stem-changing verb (o-ue). Learn more in our Stem-Changing Verbs Guide
Non-Conjugated Forms
costar
to cost
costando
Present Participle
costado
Used in perfect tenses
Indicative Mood
Used for statements of fact, certainty, and objective reality
| Person | |||||
|---|---|---|---|---|---|
| yo | cuesto | costé | costaba | costaré | costaría |
| tú | cuestas | costaste | costabas | costarás | costarías |
| él/ella/usted | cuesta | costó | costaba | costará | costaría |
| nosotros | costamos | costamos | costábamos | costaremos | costaríamos |
| vosotros | costáis | costasteis | costabais | costaréis | costaríais |
| ellos/ellas/ustedes | cuestan | costaron | costaban | costarán | costarían |
| Quick Test | Quick Test | Quick Test | Quick Test | Quick Test |
Perfect Tenses
Compound tenses using auxiliary verb "haber" + past participle
| Person | ||||
|---|---|---|---|---|
| yo | he costado | había costado | habré costado | habría costado |
| tú | has costado | habías costado | habrás costado | habrías costado |
| él/ella/usted | ha costado | había costado | habrá costado | habría costado |
| nosotros | hemos costado | habíamos costado | habremos costado | habríamos costado |
| vosotros | habéis costado | habíais costado | habréis costado | habríais costado |
| ellos/ellas/ustedes | han costado | habían costado | habrán costado | habrían costado |
| Quick Test | Quick Test | Quick Test | Quick Test |
Subjunctive Mood
Used for doubt, emotion, desire, possibility, and hypothetical situations
The imperfect subjunctive has two forms: -ra (more common in speech) and -se (more literary, common in Spain). Both are equally correct and interchangeable.
| Person | Literary / Spain | ||
|---|---|---|---|
| yo | cueste | costara | costase |
| tú | cuestes | costaras | costases |
| él/ella/usted | cueste | costara | costase |
| nosotros | costemos | costáramos | costásemos |
| vosotros | costéis | costarais | costaseis |
| ellos/ellas/ustedes | cuesten | costaran | costasen |
| Quick Test | Quick Test | Quick Test |
Literary / Spain
Imperative Mood
Used for commands, requests, and instructions
| Person | |
|---|---|
| yo | - |
| tú | cuesta |
| él/ella/usted | cueste |
| nosotros | costemos |
| vosotros | costad |
| ellos/ellas/ustedes | cuesten |
| Quick Test |
🎯 Practice costar
Test your knowledge of costar conjugations across multiple tenses
Stem Change Pattern: o-ue
This verb follows the o-ue pattern. The stem change occurs in present indicative and present subjunctive, affecting the "boot" forms (yo, tú, él/ella/usted, ellos/ellas/ustedes). Some -ir verbs also have stem changes in preterite (él/ella and ellos/ellas forms).
Usage Tips
- Indicative: Use for facts, statements, and objective reality
- Subjunctive: Use after expressions of doubt, emotion, desire, or uncertainty
- Imperative: Use for direct commands and requests
- Perfect Tenses: Use to express actions completed relative to another time
Examples and Common Phrases
Examples
Common Phrases
Verb Information
Category
Shopping
Ending Type
-ar verb
Verb Type
Stem-changing verb
Importance Rank
#59 out of 100
Usage Tips
Remember the "Boot"
Stem-changing verbs change in a "boot" shape: yo, tú, él/ella, and ellos/ellas change, but nosotros and vosotros don't. Draw a boot around the changing forms to remember!
Practice Suggestion
Try creating your own sentences with this verb. Start with simple present tense sentences and gradually work up to more complex constructions.