Investigar

Present actions and habitual activities

Ongoing past actions and descriptions

Completed past actions

Future actions and intentions

Hypothetical and conditional actions

Subjective present actions and desires

Subjective past actions and hypothetical situations

Actions completed recently or with present relevance

Actions completed before another past action

Actions completed immediately before another past action

Actions that will be completed by a future time

Actions that would have been completed under certain conditions

Subjective actions completed in relation to the present

Subjective actions completed before another past action