English Verb - To Investigate Infinitive - to investigate Present participle - investigating Past participle - investigated 1. Present Tense Singular I investigate You investigate He/she/it investigates Plural We investigate You investigate They investigate 2. Present Progressive Tense Singular I am investigating You are investigating He/she/it is investigating Plural We are investigating You are investigating They are investigating 3. Past Tense Singular I investigated You investigated He/she/it investigated Plural We investigated You investigated They investigated 4. Present Perfect Tense Singular I have investigated You have investigated He/she/it has investigated Plural We have investigated You have investigated They have investigated 5. Present Perfect Progressive Tense Singular I have been investigating You have been investigating He/she/it has been investigating Plural We have been investigating You have been investigating They have been investigating 6. Past Progressive Tense Singular I was investigating You were investigating He/she/it was investigating Plural We were investigating You were investigating They were investigating 7. Past Perfect Tense Singular I had investigated You had investigated He/she/it had investigated Plural We had investigated You had investigated They had investigated 8. Past Perfect Progressive Tense Singular I had been investigating You had been investigating He/she/it had been investigating Plural We had been investigating You had been investigating They had been investigating 9. Future Tense Singular I will investigate You will investigate He/she/it will investigate Plural We will investigate You will investigate They will investigate 10. Future Progressive Tense Singular I will be investigating You will be investigating He/she/it will be investigating Plural We will be investigating You will be investigating They will be investigating 11. Future Perfect Tense Singular I will have investigated You will have investigated He/she/it will have investigated Plural We will have investigated You will have investigated They will have investigated 12. Future Perfect Progressive Tense Singular I will have been investigating You will have been investigating He/she/it will have been investigating Plural We will have been investigating You will have been investigating They will have been investigating