I can patter you can patter she can patter we can patter you can patter they can patter
V-ing form
I can be pattering you can be pattering she can be pattering we can be pattering you can be pattering they can be pattering
Perfect
I can have pattered you can have pattered she can have pattered we can have pattered you can have pattered they can have pattered
V-ing perfect
I can have been pattering you can have been pattering she can have been pattering we can have been pattering you can have been pattering they can have been pattering
Negation
Simple form
I can't patter you can't patter she can't patter we can't patter you can't patter they can't patter
V-ing form
I can't be pattering you can't be pattering she can't be pattering we can't be pattering you can't be pattering they can't be pattering
Perfect
I can't have pattered you can't have pattered she can't have pattered we can't have pattered you can't have pattered they can't have pattered
V-ing perfect
I can't have been pattering you can't have been pattering she can't have been pattering we can't have been pattering you can't have been pattering they can't have been pattering
Interrogative form
Simple form
can I patter? can you patter? can she patter? can we patter? can you patter? can they patter?
V-ing form
can I be pattering? can you be pattering? can she be pattering? can we be pattering? can you be pattering? can they be pattering?
Perfect
can I have pattered? can you have pattered? can she have pattered? can we have pattered? can you have pattered? can they have pattered?
V-ing perfect
can I have been pattering? can you have been pattering? can she have been pattering? can we have been pattering? can you have been pattering? can they have been pattering?
Interro-negative form
Simple form
can't I patter? can't you patter? can't she patter? can't we patter? can't you patter? can't they patter?
V-ing form
can't I be pattering? can't you be pattering? can't she be pattering? can't we be pattering? can't you be pattering? can't they be pattering?
Perfect
can't I have pattered? can't you have pattered? can't she have pattered? can't we have pattered? can't you have pattered? can't they have pattered?
V-ing perfect
can't I have been pattering? can't you have been pattering? can't she have been pattering? can't we have been pattering? can't you have been pattering? can't they have been pattering?