| | singular | plural |
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| 1st person | 2nd person | 3rd person | 1st person | 2nd person | 3rd person |
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| with infinitive investigar |
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| dative | investigarme | investigarte, investigarle | investigarle, investigarse | investigarnos | investigaros, investigarles | investigarles, investigarse |
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| accusative | investigarme | investigarte, investigarlo, investigarla | investigarlo, investigarla, investigarse | investigarnos | investigaros, investigarlos, investigarlas | investigarlos, investigarlas, investigarse |
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| |
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| with gerund investigando |
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| dative | investigándome | investigándote, investigándole | investigándole, investigándose | investigándonos | investigándoos, investigándoles | investigándoles, investigándose |
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| accusative | investigándome | investigándote, investigándolo, investigándola | investigándolo, investigándola, investigándose | investigándonos | investigándoos, investigándolos, investigándolas | investigándolos, investigándolas, investigándose |
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| with informal second-person singular imperative investiga |
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| dative | investígame | investígate, investígale | investígale | investíganos | investígaos, investígales | investígales |
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| accusative | investígame | investígate, investígalo, investígala | investígalo, investígala | investíganos | investígaos, investígalos, investígalas | investígalos, investígalas |
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| with formal second-person singular imperative investigue |
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| dative | investígueme | investíguete, investíguele | investíguele, investíguese | investíguenos | investígueles | investígueles, investíguese |
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| accusative | investígueme | investíguete, investíguelo, investíguela | investíguelo, investíguela, investíguese | investíguenos | investíguelos, investíguelas | investíguelos, investíguelas, investíguese |
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| with first-person plural imperative investiguemos |
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| dative | not used | investiguémosle | investiguémosle | investiguémonos | investiguémosles | investiguémosles |
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| accusative | not used | investiguémoslo, investiguémosla | investiguémoslo, investiguémosla | investiguémonos | investiguémoslos, investiguémoslas | investiguémoslos, investiguémoslas |
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| with informal second-person plural imperative investigad |
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| dative | investigadme | investigadle | investigadle | investigadnos | investigaos, investigadles | investigadles |
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| accusative | investigadme | investigadlo, investigadla | investigadlo, investigadla | investigadnos | investigaos, investigadlos, investigadlas | investigadlos, investigadlas |
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| |
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| with formal second-person plural imperative investiguen |
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| dative | investíguenme | investíguente, investíguenle | investíguenle, investíguense | investíguenos | investíguenles | investíguenles, investíguense |
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| accusative | investíguenme | investíguente, investíguenlo, investíguenla | investíguenlo, investíguenla, investíguense | investíguenos | investíguenlos, investíguenlas | investíguenlos, investíguenlas, investíguense |
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