| Simple | Progressive | Perfect | Progressive |
| Present |
| I undertake |
| you undertake |
| he/she/it undertakes |
| we undertake |
| you all undertake |
| they undertake |
|
| I am undertaking |
| you are undertaking |
| he/she/it is undertaking |
| we are undertaking |
| you all are undertaking |
| they are undertaking |
|
| I have undertaken |
| you have undertaken |
| he/she/it has undertaken |
| we have undertaken |
| you all have undertaken |
| they have undertaken |
|
| I have been undertaking |
| you have been undertaking |
| he/she/it has been undertaking |
| we have been undertaking |
| you all have been undertaking |
| they have been undertaking |
|
| Past |
| I undertook |
| you undertook |
| he/she/it undertook |
| we undertook |
| you all undertook |
| they undertook |
|
| I was undertaking |
| you were undertaking |
| he/she/it was undertaking |
| we were undertaking |
| you all were undertaking |
| they were undertaking |
|
| I had undertaken |
| you had undertaken |
| he/she/it had undertaken |
| we had undertaken |
| you all had undertaken |
| they had undertaken |
|
| I had been undertaking |
| you had been undertaking |
| he/she/it had been undertaking |
| we had been undertaking |
| you all had been undertaking |
| they had been undertaking |
|
| Future |
| I will undertake |
| you will undertake |
| he/she/it will undertake |
| we will undertake |
| you all will undertake |
| they will undertake |
|
| I will be undertaking |
| you will be undertaking |
| he/she/it will be undertaking |
| we are undertaking |
| you all will be undertaking |
| they will be undertaking |
|
| I will have undertaken |
| you will have undertaken |
| he/she/it will have undertaken |
| we will have undertaken |
| you all will have undertaken |
| they will have undertaken |
|
| I will have been undertaking |
| you will have been undertaking |
| he/she/it will have been undertaking |
| we will have been undertaking |
| you all will have been undertaking |
| they will have been undertaking |
|
