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