| Present Tense | Past Tense | Future Tense |
|---|---|---|
| I weaken | I weakened | I shall/will weaken |
| We weaken | We weakened | We shall/will weaken |
| You weaken | You weakened | You will weaken |
| He weakens | He weakened | He will weaken |
| She weakens | She weakened | She will weaken |
| It weakens | It weakened | It will weaken |
| They weaken | They weakened | They will weaken |
| Present Continuous | Past Continuous | Future Continuous |
|---|---|---|
| I am weakening | I was weakening | I shall/will be weakening |
| We are weakening | We were weakening | We shall/will be weakening |
| You are weakening | You were weakening | You will be weakening |
| He is weakening | He was weakening | He will be weakening |
| She is weakening | She was weakening | She will be weakening |
| It is weakening | It was weakening | It will be weakening |
| They are weakening | They were weakening | They will be weakening |
| Present Perfect | Past Perfect | Future Perfect |
|---|---|---|
| I have weakened | I had weakened | I shall/will have weakened |
| We have weakened | We had weakened | We shall/will have weakened |
| You have weakened | You had weakened | You will have weakened |
| He has weakened | He had weakened | He will have weakened |
| She has weakened | She had weakened | She will have weakened |
| It has weakened | It had weakened | It will have weakened |
| They have weakened | They had weakened | They will have weakened |
| Present Perfect Continuous | Past Perfect Continuous | Future Perfect Continuous |
|---|---|---|
| I have been weakening | I had been weakening | I shall/will have been weakening |
| We have been weakening | We had been weakening | We shall/will have been weakening |
| You have been weakening | You had been weakening | You will have been weakening |
| He has been weakening | He had been weakening | He will have been weakening |
| She has been weakening | She had been weakening | She will have been weakening |
| It has been weakening | It had been weakening | It will have been weakening |
| They have been weakening | They had been weakening | They will have been weakening |