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