
Regular verb: lessen - lessened - lessened
| Present | Present continuous | Preterite | Preterite continuous | 
| do I lessen? do you lessen? does he lessen? do we lessen? do you lessen? do they lessen? | am I lessening? are you lessening? is he lessening? are we lessening? are you lessening? are they lessening? | did I lessen? did you lessen? did he lessen? did we lessen? did you lessen? did they lessen? | was I lessening? were you lessening? was he lessening? were we lessening? were you lessening? were they lessening? | 
| Present perfect | Present perfect continuous | Pluperfect | Pluperfect continuous | 
| have I lessened? have you lessened? has he lessened? have we lessened? have you lessened? have they lessened? | have I been lessening? have you been lessening? has he been lessening? have we been lessening? have you been lessening? have they been lessening? | had I lessened? had you lessened? had he lessened? had we lessened? had you lessened? had they lessened? | had I been lessening? had you been lessening? had he been lessening? had we been lessening? had you been lessening? had they been lessening? | 
| Future | Future continuous | Future perfect | Future perfect continuous | 
| will I lessen? will you lessen? will he lessen? will we lessen? will you lessen? will they lessen? | will I be lessening? will you be lessening? will he be lessening? will we be lessening? will you be lessening? will they be lessening? | will I have lessened? will you have lessened? will he have lessened? will we have lessened? will you have lessened? will they have lessened? | will I have been lessening? will you have been lessening? will he have been lessening? will we have been lessening? will you have been lessening? will they have been lessening? | 
| Present | Present continuous | Past | Past continuous | 
| would I lessen? would you lessen? would he lessen? would we lessen? would you lessen? would they lessen? | would I be lessening? would you be lessening? would he be lessening? would we be lessening? would you be lessening? would they be lessening? | would I have lessened? would you have lessened? would he have lessened? would we have lessened? would you have lessened? would they have lessened? | would I have been lessening? would you have been lessening? would he have been lessening? would we have been lessening? would you have been lessening? would they have been lessening? | 
| Infinitive | Imperative | 
| Infinitive | Imperative | ||
| to lessen | - - - | 
| Present | Past | ||
| lessening | lessened |