Table: irregular_verbs
Columns: verbs
yo
t
vos
l_ella_usted
nosotros_nosotras
vosotros_vosotras
ellos_ellas_ustedes

Question: What are all  the conjugated forms of the verb where the el/ ella/usted verb is piense?
SQL: SELECT "nosotros_nosotras" FROM irregular_verbs WHERE "l_ella_usted" = 'piense'

Question: What are all  the conjugated forms of the verb moler where the vosotros / vosotras is moláis for the yo tense?
SQL: SELECT "yo" FROM irregular_verbs WHERE "vosotros_vosotras" = 'moláis'

Question: how many verbs have the yo form as sienta?
SQL: SELECT COUNT("verbs") FROM irregular_verbs WHERE "yo" = 'sienta'

Question: What  us the conjucated form(s)  of  el/ella/ usted when the Vos (*) is muelas / molás?
SQL: SELECT "l_ella_usted" FROM irregular_verbs WHERE "vos" = 'muelas / molás'

Question: What are the forms of the conjucated vos(*) where él / ella / usted is muela
SQL: SELECT "vos" FROM irregular_verbs WHERE "l_ella_usted" = 'muela'