| singular | plural |
| Infinitive | | |
| undertake | |
| present simple | | |
| 1 | I undertake | we undertake |
| 2 | you undertake | you undertake |
| 3 | he/she/it undertakes | they undertake |
| past simple | | |
| 1 | I undertook | we undertook |
| 2 | you undertook | you undertook |
| 3 | he/she/it undertook | they undertook |
| future simple | | |
| 1 | I will/shall undertake | we will/shall undertake |
| 2 | you will/shall undertake | you will/shall undertake |
| 3 | he/she/it will/shall undertake | they will/shall undertake |
| conditional simple | | |
| 1 | I would undertake | we would undertake |
| 2 | you would undertake | you would undertake |
| 3 | he/she/it would undertake | they would undertake |
| present continuous | | |
| 1 | I am undertaking | we are undertaking |
| 2 | you are undertaking | you are undertaking |
| 3 | he/she/it is undertaking | they are undertaking |
| past continuous | | |
| 1 | I was undertaking | we were undertaking |
| 2 | you were undertaking | you were undertaking |
| 3 | he/she/it was undertaking | they were undertaking |
| future continuous | | |
| 1 | I will be undertaking | we will be undertaking |
| 2 | you will be undertaking | you will be undertaking |
| 3 | he/she/it will be undertaking | they will be undertaking |
| conditional continuous | | |
| 1 | I would be undertaking | we would be undertaking |
| 2 | you would be undertaking | you would be undertaking |
| 3 | he/she/it would be undertaking | they would be undertaking |
| present perfect | | |
| 1 | I have undertaken | we have undertaken |
| 2 | you have undertaken | you have undertaken |
| 3 | he/she/it has undertaken | they have undertaken |
| past perfect | | |
| 1 | I had undertaken | we had undertaken |
| 2 | you had undertaken | you had undertaken |
| 3 | he/she/it had undertaken | they had undertaken |
| future perfect | | |
| 1 | I will have undertaken | we will have undertaken |
| 2 | you will have undertaken | you will have undertaken |
| 3 | he/she/it will have undertaken | they will have undertaken |
| conditional perfect | | |
| 1 | I would have undertaken | we would have undertaken |
| 2 | you would have undertaken | you would have undertaken |
| 3 | he/she/it would have undertaken | they would have undertaken |
