The past tense of investigate is investigated
| Infinitive | to investigate |
| Present Tense | investigate / investigates |
| Past Tense | investigated |
| Present Participle | investigating |
| Past Participle | investigated |
| Singular | Plural |
|---|---|
| I investigate | We investigate |
| You investigate | You investigate |
| He/She/It investigates | They investigate |
| Singular | Plural |
|---|---|
| I am investigating | We are investigating |
| You are investigating | You are investigating |
| He/She/It is investigating | They are investigating |
| Singular | Plural |
|---|---|
| I have investigated | We have investigated |
| You have investigated | You have investigated |
| He/She/It has investigated | They have investigated |
| Singular | Plural |
|---|---|
| I have been investigating | We have been investigating |
| You have been investigating | You have been investigating |
| He/She/It has been investigating | They have been investigating |
| Singular | Plural |
|---|---|
| I investigated | We investigated |
| You investigated | You investigated |
| He/She/It investigated | They investigated |
| Singular | Plural |
|---|---|
| I was investigating | We were investigating |
| You were investigating | You were investigating |
| He/She/It was investigating | They were investigating |
| Singular | Plural |
|---|---|
| I had investigated | We had investigated |
| You had investigated | You had investigated |
| He/She/It had investigated | They had investigated |
| Singular | Plural |
|---|---|
| I had been investigating | We had been investigating |
| You had been investigating | You had been investigating |
| He/She/It had been investigating | They had been investigating |
| Singular | Plural |
|---|---|
| I will investigate | We will investigate |
| You will investigate | You will investigate |
| He/She/It will investigate | They will investigate |
| Singular | Plural |
|---|---|
| I will be investigating | We will be investigating |
| You will be investigating | You will be investigating |
| He/She/It will be investigating | They will be investigating |
| Singular | Plural |
|---|---|
| I will have investigated | We will have investigated |
| You will have investigated | You will have investigated |
| He/She/It will have investigated | They will have investigated |
| Singular | Plural |
|---|---|
| I will have been investigating | We will have been investigating |
| You will have been investigating | You will have been investigating |
| He/She/It will have been investigating | They will have been investigating |
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