Present
| I | understudy |
| You | understudy |
| She | understudies |
| We | understudy |
| They | understudy |
Past
| I | understudied |
| You | understudied |
| She | understudied |
| We | understudied |
| They | understudied |
Perfect
| I | have | understudied |
| You | have | understudied |
| She | has | understudied |
| We | have | understudied |
| They | have | understudied |
Future
| I | will | understudy |
| You | will | understudy |
| She | will | understudy |
| We | will | understudy |
| They | will | understudy |
Past Perfect
| I | had | understudied |
| You | had | understudied |
| She | had | understudied |
| We | had | understudied |
| They | had | understudied |
Future Perfect
| I | will | have | understudied |
| You | will | have | understudied |
| She | will | have | understudied |
| We | will | have | understudied |
| They | will | have | understudied |
Present - Conditional
| I | would | understudy |
| You | would | understudy |
| She | would | understudy |
| We | would | understudy |
| They | would | understudy |
Perfect - Conditional
| I | would | have | understudied |
| You | would | have | understudied |
| She | would | have | understudied |
| We | would | have | understudied |
| They | would | have | understudied |