If I had met Martin Luther King Jr., I __________ his work to eliminate discrimination.

conditional form of *haber* + past participle of another verb

The conditional forms of haber are:

|Pronoun |Spanish |English |
|–|–|–|
|Yo |habría |I would |
|Tú |habrías |You would |
|Él, ella, usted |habría | he, she, it, you (formal) would|
|Nosotros |habríamos | we would|
| Vosotros| habríais| you would, plural|
|ellos, ellas, ustedes |habrían |they, you -plural- would |

In this case, we´re going to use the first person, singular form with the past participle of *agradecer*:

Si yo hubiera conocido a Martin Luther King Jr. , le **habría agradecido** su trabajo para eliminar la discriminación. / If I had met Martin Luther King Jr., **I would have appreciated** his work to eliminate discrimination.