Present
| I | undulate |
| You | undulate |
| She | undulates |
| We | undulate |
| They | undulate |
Past
| I | undulated |
| You | undulated |
| She | undulated |
| We | undulated |
| They | undulated |
Perfect
| I | have | undulated |
| You | have | undulated |
| She | has | undulated |
| We | have | undulated |
| They | have | undulated |
Future
| I | will | undulate |
| You | will | undulate |
| She | will | undulate |
| We | will | undulate |
| They | will | undulate |
Past Perfect
| I | had | undulated |
| You | had | undulated |
| She | had | undulated |
| We | had | undulated |
| They | had | undulated |
Future Perfect
| I | will | have | undulated |
| You | will | have | undulated |
| She | will | have | undulated |
| We | will | have | undulated |
| They | will | have | undulated |
Present - Conditional
| I | would | undulate |
| You | would | undulate |
| She | would | undulate |
| We | would | undulate |
| They | would | undulate |
Perfect - Conditional
| I | would | have | undulated |
| You | would | have | undulated |
| She | would | have | undulated |
| We | would | have | undulated |
| They | would | have | undulated |