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