| Present Tense | Past Tense | Future Tense |
|---|---|---|
| I ascertain | I ascertained | I shall/will ascertain |
| We ascertain | We ascertained | We shall/will ascertain |
| You ascertain | You ascertained | You will ascertain |
| He ascertains | He ascertained | He will ascertain |
| She ascertains | She ascertained | She will ascertain |
| It ascertains | It ascertained | It will ascertain |
| They ascertain | They ascertained | They will ascertain |
| Present Continuous | Past Continuous | Future Continuous |
|---|---|---|
| I am ascertaining | I was ascertaining | I shall/will be ascertaining |
| We are ascertaining | We were ascertaining | We shall/will be ascertaining |
| You are ascertaining | You were ascertaining | You will be ascertaining |
| He is ascertaining | He was ascertaining | He will be ascertaining |
| She is ascertaining | She was ascertaining | She will be ascertaining |
| It is ascertaining | It was ascertaining | It will be ascertaining |
| They are ascertaining | They were ascertaining | They will be ascertaining |
| Present Perfect | Past Perfect | Future Perfect |
|---|---|---|
| I have ascertained | I had ascertained | I shall/will have ascertained |
| We have ascertained | We had ascertained | We shall/will have ascertained |
| You have ascertained | You had ascertained | You will have ascertained |
| He has ascertained | He had ascertained | He will have ascertained |
| She has ascertained | She had ascertained | She will have ascertained |
| It has ascertained | It had ascertained | It will have ascertained |
| They have ascertained | They had ascertained | They will have ascertained |
| Present Perfect Continuous | Past Perfect Continuous | Future Perfect Continuous |
|---|---|---|
| I have been ascertaining | I had been ascertaining | I shall/will have been ascertaining |
| We have been ascertaining | We had been ascertaining | We shall/will have been ascertaining |
| You have been ascertaining | You had been ascertaining | You will have been ascertaining |
| He has been ascertaining | He had been ascertaining | He will have been ascertaining |
| She has been ascertaining | She had been ascertaining | She will have been ascertaining |
| It has been ascertaining | It had been ascertaining | It will have been ascertaining |
| They have been ascertaining | They had been ascertaining | They will have been ascertaining |