English verb conjugation
COULD PATTER

Regular verb: patter - pattered - pattered

Affirmation

Simple form	V-ing form
I could patter you could patter she could patter we could patter you could patter they could patter	I could be pattering you could be pattering she could be pattering we could be pattering you could be pattering they could be pattering
Perfect	V-ing perfect
I could have pattered you could have pattered she could have pattered we could have pattered you could have pattered they could have pattered	I could have been pattering you could have been pattering she could have been pattering we could have been pattering you could have been pattering they could have been pattering

Negation

Simple form	V-ing form
I couldn't patter you couldn't patter she couldn't patter we couldn't patter you couldn't patter they couldn't patter	I couldn't be pattering you couldn't be pattering she couldn't be pattering we couldn't be pattering you couldn't be pattering they couldn't be pattering
Perfect	V-ing perfect
I couldn't have pattered you couldn't have pattered she couldn't have pattered we couldn't have pattered you couldn't have pattered they couldn't have pattered	I couldn't have been pattering you couldn't have been pattering she couldn't have been pattering we couldn't have been pattering you couldn't have been pattering they couldn't have been pattering

Interrogative form

Simple form	V-ing form
could I patter? could you patter? could she patter? could we patter? could you patter? could they patter?	could I be pattering? could you be pattering? could she be pattering? could we be pattering? could you be pattering? could they be pattering?
Perfect	V-ing perfect
could I have pattered? could you have pattered? could she have pattered? could we have pattered? could you have pattered? could they have pattered?	could I have been pattering? could you have been pattering? could she have been pattering? could we have been pattering? could you have been pattering? could they have been pattering?

Interro-negative form

Simple form	V-ing form
couldn't I patter? couldn't you patter? couldn't she patter? couldn't we patter? couldn't you patter? couldn't they patter?	couldn't I be pattering? couldn't you be pattering? couldn't she be pattering? couldn't we be pattering? couldn't you be pattering? couldn't they be pattering?
Perfect	V-ing perfect
couldn't I have pattered? couldn't you have pattered? couldn't she have pattered? couldn't we have pattered? couldn't you have pattered? couldn't they have pattered?	couldn't I have been pattering? couldn't you have been pattering? couldn't she have been pattering? couldn't we have been pattering? couldn't you have been pattering? couldn't they have been pattering?