Present
| I | underestimate |
| You | underestimate |
| She | underestimates |
| We | underestimate |
| They | underestimate |
Past
| I | underestimated |
| You | underestimated |
| She | underestimated |
| We | underestimated |
| They | underestimated |
Perfect
| I | have | underestimated |
| You | have | underestimated |
| She | has | underestimated |
| We | have | underestimated |
| They | have | underestimated |
Future
| I | will | underestimate |
| You | will | underestimate |
| She | will | underestimate |
| We | will | underestimate |
| They | will | underestimate |
Past Perfect
| I | had | underestimated |
| You | had | underestimated |
| She | had | underestimated |
| We | had | underestimated |
| They | had | underestimated |
Future Perfect
| I | will | have | underestimated |
| You | will | have | underestimated |
| She | will | have | underestimated |
| We | will | have | underestimated |
| They | will | have | underestimated |
Present - Conditional
| I | would | underestimate |
| You | would | underestimate |
| She | would | underestimate |
| We | would | underestimate |
| They | would | underestimate |
Perfect - Conditional
| I | would | have | underestimated |
| You | would | have | underestimated |
| She | would | have | underestimated |
| We | would | have | underestimated |
| They | would | have | underestimated |