| I | investigate |
| you | investigate |
| he/she/it | investigates |
| we | investigate |
| you | investigate |
| they | investigate |
| I | have investigated |
| you | have investigated |
| he/she/it | has investigated |
| we | have investigated |
| you | have investigated |
| they | have investigated |
| I | investigated |
| you | investigated |
| he/she/it | investigated |
| we | investigated |
| you | investigated |
| they | investigated |
| I | had investigated |
| you | had investigated |
| he/she/it | had investigated |
| we | had investigated |
| you | had investigated |
| they | had investigated |
| I | will investigate |
| you | will investigate |
| he/she/it | will investigate |
| we | will investigate |
| you | will investigate |
| they | will investigate |
| I | will have investigated |
| you | will have investigated |
| he/she/it | will have investigated |
| we | will have investigated |
| you | will have investigated |
| they | will have investigated |
| I | am investigating |
| you | are investigating |
| he/she/it | is investigating |
| we | are investigating |
| you | are investigating |
| they | are investigating |
| I | have been investigating |
| you | have been investigating |
| he/she/it | has been investigating |
| we | have been investigating |
| you | have been investigating |
| they | have been investigating |
| I | was investigating |
| you | were investigating |
| he/she/it | was investigating |
| we | were investigating |
| you | were investigating |
| they | were investigating |
| I | had been investigating |
| you | had been investigating |
| he/she/it | had been investigating |
| we | had been investigating |
| you | had been investigating |
| they | had been investigating |
| I | will be investigating |
| you | will be investigating |
| he/she/it | will be investigating |
| we | will be investigating |
| you | will be investigating |
| they | will be investigating |
| I | will have been investigating |
| you | will have been investigating |
| he/she/it | will have been investigating |
| we | will have been investigating |
| you | will have been investigating |
| they | will have been investigating |
| I | would investigate |
| you | would investigate |
| he/she/it | would investigate |
| we | would investigate |
| you | would investigate |
| they | would investigate |
| I | would have investigated |
| you | would have investigated |
| he/she/it | would have investigated |
| we | would have investigated |
| you | would have investigated |
| they | would have investigated |
| I | would be investigating |
| you | would be investigating |
| he/she/it | would be investigating |
| we | would be investigating |
| you | would be investigating |
| they | would be investigating |
| I | would have been investigating |
| you | would have been investigating |
| he/she/it | would have been investigating |
| we | would have been investigating |
| you | would have been investigating |
| they | would have been investigating |
| You | investigate |
| we | Let's investigate |
| You | investigate |