saber
to know (facts)
No sé la respuesta.
I don't know the answer.
saber present indicative
Habitual and ongoing actions in the present.
saber present continuous
Action in progress right now. Periphrastic: estar (present) + gerund.
saber preterite
Completed actions at a specific moment in the past.
saber imperfect
Habitual past actions, descriptions, background.
saber present perfect
Completed actions with present relevance. Auxiliary haber + participle.
saber future
Actions yet to happen.
saber informal future
Near-future plans. Periphrastic: ir (present) + a + infinitive.
saber future perfect
Action that will have been completed by a future moment. Auxiliary haber (future) + participle.
saber conditional
Hypothetical or polite would-actions.
saber conditional perfect
Hypothetical past: would have done. Auxiliary haber (conditional) + participle.
saber pluperfect
An action completed before another past action.
saber subjunctive present
Desires, doubts, and hypotheticals in the present.
saber subjunctive imperfect
Past subjunctive: desires, doubts, hypotheticals in the past.
saber subjunctive present perfect
Completed actions in subjunctive contexts.
saber subjunctive pluperfect
Past-perfect actions in subjunctive contexts.
saber imperative (affirmative)
Affirmative commands.
saber imperative (negative)
Negative commands: borrows subjunctive present.