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