
Verbe régulier : lengthen -  lengthened - lengthened
Traduction française : s'allonger - allonger 
Forme simple | Forme en V-ing | 
| I could lengthen you could lengthen he could lengthen we could lengthen you could lengthen they could lengthen  | I could be lengthening you could be lengthening he could be lengthening we could be lengthening you could be lengthening they could be lengthening  | 
Perfect | Perfect en V-ing | 
| I could have lengthened you could have lengthened he could have lengthened we could have lengthened you could have lengthened they could have lengthened  | I could have been lengthening you could have been lengthening he could have been lengthening we could have been lengthening you could have been lengthening they could have been lengthening  | 
Forme simple | Forme en V-ing | 
| I couldn't lengthen you couldn't lengthen he couldn't lengthen we couldn't lengthen you couldn't lengthen they couldn't lengthen  | I couldn't be lengthening you couldn't be lengthening he couldn't be lengthening we couldn't be lengthening you couldn't be lengthening they couldn't be lengthening  | 
Perfect | Perfect en V-ing | 
| I couldn't have lengthened you couldn't have lengthened he couldn't have lengthened we couldn't have lengthened you couldn't have lengthened they couldn't have lengthened  | I couldn't have been lengthening you couldn't have been lengthening he couldn't have been lengthening we couldn't have been lengthening you couldn't have been lengthening they couldn't have been lengthening  | 
Forme simple | Forme en V-ing | 
| could I lengthen? could you lengthen? could he lengthen? could we lengthen? could you lengthen? could they lengthen?  | could I be lengthening? could you be lengthening? could he be lengthening? could we be lengthening? could you be lengthening? could they be lengthening?  | 
Perfect | Perfect en V-ing | 
| could I have lengthened? could you have lengthened? could he have lengthened? could we have lengthened? could you have lengthened? could they have lengthened?  | could I have been lengthening? could you have been lengthening? could he have been lengthening? could we have been lengthening? could you have been lengthening? could they have been lengthening?  | 
Forme simple | Forme en V-ing | 
| couldn't I lengthen? couldn't you lengthen? couldn't he lengthen? couldn't we lengthen? couldn't you lengthen? couldn't they lengthen?  | couldn't I be lengthening? couldn't you be lengthening? couldn't he be lengthening? couldn't we be lengthening? couldn't you be lengthening? couldn't they be lengthening?  | 
Perfect | Perfect en V-ing | 
| couldn't I have lengthened? couldn't you have lengthened? couldn't he have lengthened? couldn't we have lengthened? couldn't you have lengthened? couldn't they have lengthened?  | couldn't I have been lengthening? couldn't you have been lengthening? couldn't he have been lengthening? couldn't we have been lengthening? couldn't you have been lengthening? couldn't they have been lengthening?  |