| I | underestimate |
| you | underestimate |
| he/she/it | underestimates |
| we | underestimate |
| you | underestimate |
| they | underestimate |
| I | have underestimated |
| you | have underestimated |
| he/she/it | has underestimated |
| we | have underestimated |
| you | have underestimated |
| they | have underestimated |
| I | underestimated |
| you | underestimated |
| he/she/it | underestimated |
| we | underestimated |
| you | underestimated |
| they | underestimated |
| I | had underestimated |
| you | had underestimated |
| he/she/it | had underestimated |
| we | had underestimated |
| you | had underestimated |
| they | had underestimated |
| I | will underestimate |
| you | will underestimate |
| he/she/it | will underestimate |
| we | will underestimate |
| you | will underestimate |
| they | will underestimate |
| I | will have underestimated |
| you | will have underestimated |
| he/she/it | will have underestimated |
| we | will have underestimated |
| you | will have underestimated |
| they | will have underestimated |
| I | am underestimating |
| you | are underestimating |
| he/she/it | is underestimating |
| we | are underestimating |
| you | are underestimating |
| they | are underestimating |
| I | have been underestimating |
| you | have been underestimating |
| he/she/it | has been underestimating |
| we | have been underestimating |
| you | have been underestimating |
| they | have been underestimating |
| I | was underestimating |
| you | were underestimating |
| he/she/it | was underestimating |
| we | were underestimating |
| you | were underestimating |
| they | were underestimating |
| I | had been underestimating |
| you | had been underestimating |
| he/she/it | had been underestimating |
| we | had been underestimating |
| you | had been underestimating |
| they | had been underestimating |
| I | will be underestimating |
| you | will be underestimating |
| he/she/it | will be underestimating |
| we | will be underestimating |
| you | will be underestimating |
| they | will be underestimating |
| I | will have been underestimating |
| you | will have been underestimating |
| he/she/it | will have been underestimating |
| we | will have been underestimating |
| you | will have been underestimating |
| they | will have been underestimating |
| I | would underestimate |
| you | would underestimate |
| he/she/it | would underestimate |
| we | would underestimate |
| you | would underestimate |
| they | would underestimate |
| I | would have underestimated |
| you | would have underestimated |
| he/she/it | would have underestimated |
| we | would have underestimated |
| you | would have underestimated |
| they | would have underestimated |
| I | would be underestimating |
| you | would be underestimating |
| he/she/it | would be underestimating |
| we | would be underestimating |
| you | would be underestimating |
| they | would be underestimating |
| I | would have been underestimating |
| you | would have been underestimating |
| he/she/it | would have been underestimating |
| we | would have been underestimating |
| you | would have been underestimating |
| they | would have been underestimating |
| You | underestimate |
| we | Let's underestimate |
| You | underestimate |