Infinitive: to keep it up
Participle: kept it up
Gerund: keeping it up
| I | keep it up |
| you | keep it up |
| he;she;it | keeps it up |
| we | keep it up |
| you | keep it up |
| they | keep it up |
| I | have kept it up |
| you | have kept it up |
| he;she;it | has kept it up |
| we | have kept it up |
| you | have kept it up |
| they | have kept it up |
| I | kept it up |
| you | kept it up |
| he;she;it | kept it up |
| we | kept it up |
| you | kept it up |
| they | kept it up |
| I | had kept it up |
| you | had kept it up |
| he;she;it | had kept it up |
| we | had kept it up |
| you | had kept it up |
| they | had kept it up |
| I | will keep it up |
| you | will keep it up |
| he;she;it | will keep it up |
| we | will keep it up |
| you | will keep it up |
| they | will keep it up |
| I | will have kept it up |
| you | will have kept it up |
| he;she;it | will have kept it up |
| we | will have kept it up |
| you | will have kept it up |
| they | will have kept it up |
| I | keep it up |
| you | keep it up |
| he;she;it | keep it up |
| we | keep it up |
| you | keep it up |
| they | keep it up |
| I | have kept it up |
| you | have kept it up |
| he;she;it | have kept it up |
| we | have kept it up |
| you | have kept it up |
| they | have kept it up |
| I | kept it up |
| you | kept it up |
| he;she;it | kept it up |
| we | kept it up |
| you | kept it up |
| they | kept it up |
| I | had kept it up |
| you | had kept it up |
| he;she;it | had kept it up |
| we | had kept it up |
| you | had kept it up |
| they | had kept it up |
| I | would keep it up |
| you | would keep it up |
| he;she;it | would keep it up |
| we | would keep it up |
| you | would keep it up |
| they | would keep it up |
| I | would have kept it up |
| you | would have kept it up |
| he;she;it | would have kept it up |
| we | would have kept it up |
| you | would have kept it up |
| they | would have kept it up |
| you | keep it up |
| we | Let's keep it up |
| you | keep it up |
| I | am keeping it up |
| you | are keeping it up |
| he;she;it | is keeping it up |
| we | are keeping it up |
| you | are keeping it up |
| they | are keeping it up |
| I | have been keeping it up |
| you | have been keeping it up |
| he;she;it | has been keeping it up |
| we | have been keeping it up |
| you | have been keeping it up |
| they | have been keeping it up |
| I | was keeping it up |
| you | were keeping it up |
| he;she;it | was keeping it up |
| we | were keeping it up |
| you | were keeping it up |
| they | were keeping it up |
| I | had been keeping it up |
| you | had been keeping it up |
| he;she;it | had been keeping it up |
| we | had been keeping it up |
| you | had been keeping it up |
| they | had been keeping it up |
| I | will be keeping it up |
| you | will be keeping it up |
| he;she;it | will be keeping it up |
| we | will be keeping it up |
| you | will be keeping it up |
| they | will be keeping it up |
| I | will have been keeping it up |
| you | will have been keeping it up |
| he;she;it | will have been keeping it up |
| we | will have been keeping it up |
| you | will have been keeping it up |
| they | will have been keeping it up |
| I | would be keeping it up |
| you | would be keeping it up |
| he;she;it | would be keeping it up |
| we | would be keeping it up |
| you | would be keeping it up |
| they | would be keeping it up |
| I | would have been keeping it up |
| you | would have been keeping it up |
| he;she;it | would have been keeping it up |
| we | would have been keeping it up |
| you | would have been keeping it up |
| they | would have been keeping it up |
"The word prob. belongs primarily to the vulgar and non-literary stratum of the language; but it comes up suddenly into literary use c.1000, and that in many senses, indicating considerable previous development." [OED]Meaning "financially support and privately control" (usually in ref. to mistresses) is from 1560. The noun meaning "innermost stronghold of a tower" is from 1586, perhaps a translation of It. tenazza, with a notion of "that which keeps" (someone or something); the sense of "food required to keep a person or animal" is attested from 1801. Keepsake is first recorded 1790, on model of namesake; thus an object kept for the sake of the giver. For keeps "completely, for good" is Amer.Eng. colloquial, from 1861. Keeper "one who has charge of some person or thing, warden" is from c.1300; sense of "one who carries on some business" is from c.1440.