| Present Tense | Past Tense | Future Tense |
|---|---|---|
| I certify | I certified | I shall/will certify |
| We certify | We certified | We shall/will certify |
| You certify | You certified | You will certify |
| He certifies | He certified | He will certify |
| She certifies | She certified | She will certify |
| It certifies | It certified | It will certify |
| They certify | They certified | They will certify |
| Present Continuous | Past Continuous | Future Continuous |
|---|---|---|
| I am certifying | I was certifying | I shall/will be certifying |
| We are certifying | We were certifying | We shall/will be certifying |
| You are certifying | You were certifying | You will be certifying |
| He is certifying | He was certifying | He will be certifying |
| She is certifying | She was certifying | She will be certifying |
| It is certifying | It was certifying | It will be certifying |
| They are certifying | They were certifying | They will be certifying |
| Present Perfect | Past Perfect | Future Perfect |
|---|---|---|
| I have certified | I had certified | I shall/will have certified |
| We have certified | We had certified | We shall/will have certified |
| You have certified | You had certified | You will have certified |
| He has certified | He had certified | He will have certified |
| She has certified | She had certified | She will have certified |
| It has certified | It had certified | It will have certified |
| They have certified | They had certified | They will have certified |
| Present Perfect Continuous | Past Perfect Continuous | Future Perfect Continuous |
|---|---|---|
| I have been certifying | I had been certifying | I shall/will have been certifying |
| We have been certifying | We had been certifying | We shall/will have been certifying |
| You have been certifying | You had been certifying | You will have been certifying |
| He has been certifying | He had been certifying | He will have been certifying |
| She has been certifying | She had been certifying | She will have been certifying |
| It has been certifying | It had been certifying | It will have been certifying |
| They have been certifying | They had been certifying | They will have been certifying |