| I | underpin |
| you | underpin |
| he/she/it | underpins |
| we | underpin |
| you | underpin |
| they | underpin |
| I | have underpinned |
| you | have underpinned |
| he/she/it | has underpinned |
| we | have underpinned |
| you | have underpinned |
| they | have underpinned |
| I | underpinned |
| you | underpinned |
| he/she/it | underpinned |
| we | underpinned |
| you | underpinned |
| they | underpinned |
| I | had underpinned |
| you | had underpinned |
| he/she/it | had underpinned |
| we | had underpinned |
| you | had underpinned |
| they | had underpinned |
| I | will underpin |
| you | will underpin |
| he/she/it | will underpin |
| we | will underpin |
| you | will underpin |
| they | will underpin |
| I | will have underpinned |
| you | will have underpinned |
| he/she/it | will have underpinned |
| we | will have underpinned |
| you | will have underpinned |
| they | will have underpinned |
| I | am underpinning |
| you | are underpinning |
| he/she/it | is underpinning |
| we | are underpinning |
| you | are underpinning |
| they | are underpinning |
| I | have been underpinning |
| you | have been underpinning |
| he/she/it | has been underpinning |
| we | have been underpinning |
| you | have been underpinning |
| they | have been underpinning |
| I | was underpinning |
| you | were underpinning |
| he/she/it | was underpinning |
| we | were underpinning |
| you | were underpinning |
| they | were underpinning |
| I | had been underpinning |
| you | had been underpinning |
| he/she/it | had been underpinning |
| we | had been underpinning |
| you | had been underpinning |
| they | had been underpinning |
| I | will be underpinning |
| you | will be underpinning |
| he/she/it | will be underpinning |
| we | will be underpinning |
| you | will be underpinning |
| they | will be underpinning |
| I | will have been underpinning |
| you | will have been underpinning |
| he/she/it | will have been underpinning |
| we | will have been underpinning |
| you | will have been underpinning |
| they | will have been underpinning |
| I | would underpin |
| you | would underpin |
| he/she/it | would underpin |
| we | would underpin |
| you | would underpin |
| they | would underpin |
| I | would have underpinned |
| you | would have underpinned |
| he/she/it | would have underpinned |
| we | would have underpinned |
| you | would have underpinned |
| they | would have underpinned |
| I | would be underpinning |
| you | would be underpinning |
| he/she/it | would be underpinning |
| we | would be underpinning |
| you | would be underpinning |
| they | would be underpinning |
| I | would have been underpinning |
| you | would have been underpinning |
| he/she/it | would have been underpinning |
| we | would have been underpinning |
| you | would have been underpinning |
| they | would have been underpinning |
| You | underpin |
| we | Let's underpin |
| You | underpin |