The past tense of undertake is undertook
| Infinitive | to undertake |
| Present Tense | undertake / undertakes |
| Past Tense | undertook |
| Present Participle | undertaking |
| Past Participle | undertaken |
| Singular | Plural |
|---|---|
| I undertake | We undertake |
| You undertake | You undertake |
| He/She/It undertakes | They undertake |
| Singular | Plural |
|---|---|
| I am undertaking | We are undertaking |
| You are undertaking | You are undertaking |
| He/She/It is undertaking | They are undertaking |
| Singular | Plural |
|---|---|
| I have undertaken | We have undertaken |
| You have undertaken | You have undertaken |
| He/She/It has undertaken | They have undertaken |
| Singular | Plural |
|---|---|
| I have been undertaking | We have been undertaking |
| You have been undertaking | You have been undertaking |
| He/She/It has been undertaking | They have been undertaking |
| Singular | Plural |
|---|---|
| I undertook | We undertook |
| You undertook | You undertook |
| He/She/It undertook | They undertook |
| Singular | Plural |
|---|---|
| I was undertaking | We were undertaking |
| You were undertaking | You were undertaking |
| He/She/It was undertaking | They were undertaking |
| Singular | Plural |
|---|---|
| I had undertaken | We had undertaken |
| You had undertaken | You had undertaken |
| He/She/It had undertaken | They had undertaken |
| Singular | Plural |
|---|---|
| I had been undertaking | We had been undertaking |
| You had been undertaking | You had been undertaking |
| He/She/It had been undertaking | They had been undertaking |
| Singular | Plural |
|---|---|
| I will undertake | We will undertake |
| You will undertake | You will undertake |
| He/She/It will undertake | They will undertake |
| Singular | Plural |
|---|---|
| I will be undertaking | We will be undertaking |
| You will be undertaking | You will be undertaking |
| He/She/It will be undertaking | They will be undertaking |
| Singular | Plural |
|---|---|
| I will have undertaken | We will have undertaken |
| You will have undertaken | You will have undertaken |
| He/She/It will have undertaken | They will have undertaken |
| Singular | Plural |
|---|---|
| I will have been undertaking | We will have been undertaking |
| You will have been undertaking | You will have been undertaking |
| He/She/It will have been undertaking | They will have been undertaking |
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