| I | strengthen |
| you | strengthen |
| he/she/it | strengthens |
| we | strengthen |
| you | strengthen |
| they | strengthen |
| I | have strengthened |
| you | have strengthened |
| he/she/it | has strengthened |
| we | have strengthened |
| you | have strengthened |
| they | have strengthened |
| I | strengthened |
| you | strengthened |
| he/she/it | strengthened |
| we | strengthened |
| you | strengthened |
| they | strengthened |
| I | had strengthened |
| you | had strengthened |
| he/she/it | had strengthened |
| we | had strengthened |
| you | had strengthened |
| they | had strengthened |
| I | will strengthen |
| you | will strengthen |
| he/she/it | will strengthen |
| we | will strengthen |
| you | will strengthen |
| they | will strengthen |
| I | will have strengthened |
| you | will have strengthened |
| he/she/it | will have strengthened |
| we | will have strengthened |
| you | will have strengthened |
| they | will have strengthened |
| I | am strengthening |
| you | are strengthening |
| he/she/it | is strengthening |
| we | are strengthening |
| you | are strengthening |
| they | are strengthening |
| I | have been strengthening |
| you | have been strengthening |
| he/she/it | has been strengthening |
| we | have been strengthening |
| you | have been strengthening |
| they | have been strengthening |
| I | was strengthening |
| you | were strengthening |
| he/she/it | was strengthening |
| we | were strengthening |
| you | were strengthening |
| they | were strengthening |
| I | had been strengthening |
| you | had been strengthening |
| he/she/it | had been strengthening |
| we | had been strengthening |
| you | had been strengthening |
| they | had been strengthening |
| I | will be strengthening |
| you | will be strengthening |
| he/she/it | will be strengthening |
| we | will be strengthening |
| you | will be strengthening |
| they | will be strengthening |
| I | will have been strengthening |
| you | will have been strengthening |
| he/she/it | will have been strengthening |
| we | will have been strengthening |
| you | will have been strengthening |
| they | will have been strengthening |
| I | would strengthen |
| you | would strengthen |
| he/she/it | would strengthen |
| we | would strengthen |
| you | would strengthen |
| they | would strengthen |
| I | would have strengthened |
| you | would have strengthened |
| he/she/it | would have strengthened |
| we | would have strengthened |
| you | would have strengthened |
| they | would have strengthened |
| I | would be strengthening |
| you | would be strengthening |
| he/she/it | would be strengthening |
| we | would be strengthening |
| you | would be strengthening |
| they | would be strengthening |
| I | would have been strengthening |
| you | would have been strengthening |
| he/she/it | would have been strengthening |
| we | would have been strengthening |
| you | would have been strengthening |
| they | would have been strengthening |
| You | strengthen |
| we | Let's strengthen |
| You | strengthen |