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