I can skitter you can skitter she can skitter we can skitter you can skitter they can skitter
V-ing form
I can be skittering you can be skittering she can be skittering we can be skittering you can be skittering they can be skittering
Perfect
I can have skittered you can have skittered she can have skittered we can have skittered you can have skittered they can have skittered
V-ing perfect
I can have been skittering you can have been skittering she can have been skittering we can have been skittering you can have been skittering they can have been skittering
Negation
Simple form
I can't skitter you can't skitter she can't skitter we can't skitter you can't skitter they can't skitter
V-ing form
I can't be skittering you can't be skittering she can't be skittering we can't be skittering you can't be skittering they can't be skittering
Perfect
I can't have skittered you can't have skittered she can't have skittered we can't have skittered you can't have skittered they can't have skittered
V-ing perfect
I can't have been skittering you can't have been skittering she can't have been skittering we can't have been skittering you can't have been skittering they can't have been skittering
Interrogative form
Simple form
can I skitter? can you skitter? can she skitter? can we skitter? can you skitter? can they skitter?
V-ing form
can I be skittering? can you be skittering? can she be skittering? can we be skittering? can you be skittering? can they be skittering?
Perfect
can I have skittered? can you have skittered? can she have skittered? can we have skittered? can you have skittered? can they have skittered?
V-ing perfect
can I have been skittering? can you have been skittering? can she have been skittering? can we have been skittering? can you have been skittering? can they have been skittering?
Interro-negative form
Simple form
can't I skitter? can't you skitter? can't she skitter? can't we skitter? can't you skitter? can't they skitter?
V-ing form
can't I be skittering? can't you be skittering? can't she be skittering? can't we be skittering? can't you be skittering? can't they be skittering?
Perfect
can't I have skittered? can't you have skittered? can't she have skittered? can't we have skittered? can't you have skittered? can't they have skittered?
V-ing perfect
can't I have been skittering? can't you have been skittering? can't she have been skittering? can't we have been skittering? can't you have been skittering? can't they have been skittering?