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