| Simple | Progressive | Perfect | Progressive |
| Present |
| I undulate |
| you undulate |
| he/she/it undulates |
| we undulate |
| you all undulate |
| they undulate |
|
| I am undulating |
| you are undulating |
| he/she/it is undulating |
| we are undulating |
| you all are undulating |
| they are undulating |
|
| I have undulated |
| you have undulated |
| he/she/it has undulated |
| we have undulated |
| you all have undulated |
| they have undulated |
|
| I have been undulating |
| you have been undulating |
| he/she/it has been undulating |
| we have been undulating |
| you all have been undulating |
| they have been undulating |
|
| Past |
| I undulated |
| you undulated |
| he/she/it undulated |
| we undulated |
| you all undulated |
| they undulated |
|
| I was undulating |
| you were undulating |
| he/she/it was undulating |
| we were undulating |
| you all were undulating |
| they were undulating |
|
| I had undulated |
| you had undulated |
| he/she/it had undulated |
| we had undulated |
| you all had undulated |
| they had undulated |
|
| I had been undulating |
| you had been undulating |
| he/she/it had been undulating |
| we had been undulating |
| you all had been undulating |
| they had been undulating |
|
| Future |
| I will undulate |
| you will undulate |
| he/she/it will undulate |
| we will undulate |
| you all will undulate |
| they will undulate |
|
| I will be undulating |
| you will be undulating |
| he/she/it will be undulating |
| we are undulating |
| you all will be undulating |
| they will be undulating |
|
| I will have undulated |
| you will have undulated |
| he/she/it will have undulated |
| we will have undulated |
| you all will have undulated |
| they will have undulated |
|
| I will have been undulating |
| you will have been undulating |
| he/she/it will have been undulating |
| we will have been undulating |
| you all will have been undulating |
| they will have been undulating |
|
