| I | harp on |
| you | harp on |
| he/she/it | harps on |
| we | harp on |
| you | harp on |
| they | harp on |
| I | have harped on |
| you | have harped on |
| he/she/it | has harped on |
| we | have harped on |
| you | have harped on |
| they | have harped on |
| I | harped on |
| you | harped on |
| he/she/it | harped on |
| we | harped on |
| you | harped on |
| they | harped on |
| I | had harped on |
| you | had harped on |
| he/she/it | had harped on |
| we | had harped on |
| you | had harped on |
| they | had harped on |
| I | will harp on |
| you | will harp on |
| he/she/it | will harp on |
| we | will harp on |
| you | will harp on |
| they | will harp on |
| I | will have harped on |
| you | will have harped on |
| he/she/it | will have harped on |
| we | will have harped on |
| you | will have harped on |
| they | will have harped on |
| I | am harping on |
| you | are harping on |
| he/she/it | is harping on |
| we | are harping on |
| you | are harping on |
| they | are harping on |
| I | have been harping on |
| you | have been harping on |
| he/she/it | has been harping on |
| we | have been harping on |
| you | have been harping on |
| they | have been harping on |
| I | was harping on |
| you | were harping on |
| he/she/it | was harping on |
| we | were harping on |
| you | were harping on |
| they | were harping on |
| I | had been harping on |
| you | had been harping on |
| he/she/it | had been harping on |
| we | had been harping on |
| you | had been harping on |
| they | had been harping on |
| I | will be harping on |
| you | will be harping on |
| he/she/it | will be harping on |
| we | will be harping on |
| you | will be harping on |
| they | will be harping on |
| I | will have been harping on |
| you | will have been harping on |
| he/she/it | will have been harping on |
| we | will have been harping on |
| you | will have been harping on |
| they | will have been harping on |
| I | would harp on |
| you | would harp on |
| he/she/it | would harp on |
| we | would harp on |
| you | would harp on |
| they | would harp on |
| I | would have harped on |
| you | would have harped on |
| he/she/it | would have harped on |
| we | would have harped on |
| you | would have harped on |
| they | would have harped on |
| I | would be harping on |
| you | would be harping on |
| he/she/it | would be harping on |
| we | would be harping on |
| you | would be harping on |
| they | would be harping on |
| I | would have been harping on |
| you | would have been harping on |
| he/she/it | would have been harping on |
| we | would have been harping on |
| you | would have been harping on |
| they | would have been harping on |
| You | harp on |
| we | Let's harp on |
| You | harp on |