
Regular verb: lengthen - lengthened - lengthened
Present | Present continuous | Preterite | Preterite continuous | 
| I lengthen you lengthen she lengthens we lengthen you lengthen they lengthen  | I am lengthening you are lengthening she is lengthening we are lengthening you are lengthening they are lengthening  | I lengthened you lengthened she lengthened we lengthened you lengthened they lengthened  | I was lengthening you were lengthening she was lengthening we were lengthening you were lengthening they were lengthening  | 
Present perfect | Present perfect continuous | Pluperfect | Pluperfect continuous | 
| I have lengthened you have lengthened she has lengthened we have lengthened you have lengthened they have lengthened  | I have been lengthening you have been lengthening she has been lengthening we have been lengthening you have been lengthening they have been lengthening  | I had lengthened you had lengthened she had lengthened we had lengthened you had lengthened they had lengthened  | I had been lengthening you had been lengthening she had been lengthening we had been lengthening you had been lengthening they had been lengthening  | 
Future | Future continuous | Future perfect | Future perfect continuous | 
| I will lengthen you will lengthen she will lengthen we will lengthen you will lengthen they will lengthen  | I will be lengthening you will be lengthening she will be lengthening we will be lengthening you will be lengthening they will be lengthening  | I will have lengthened you will have lengthened she will have lengthened we will have lengthened you will have lengthened they will have lengthened  | I will have been lengthening you will have been lengthening she will have been lengthening we will have been lengthening you will have been lengthening they will have been lengthening  | 
Present | Present continuous | Past | Past continuous | 
| I would lengthen you would lengthen she would lengthen we would lengthen you would lengthen they would lengthen  | I would be lengthening you would be lengthening she would be lengthening we would be lengthening you would be lengthening they would be lengthening  | I would have lengthened you would have lengthened she would have lengthened we would have lengthened you would have lengthened they would have lengthened  | I would have been lengthening you would have been lengthening she would have been lengthening we would have been lengthening you would have been lengthening they would have been lengthening  | 
Infinitive | Imperative | 
Infinitive | Imperative | ||
| to lengthen | lengthen Let's lengthen lengthen  | 
Present | Past | ||
| lengthening | lengthened |