I can pitterpatter you can pitterpatter he can pitterpatter we can pitterpatter you can pitterpatter they can pitterpatter
V-ing form
I can be pitterpattering you can be pitterpattering he can be pitterpattering we can be pitterpattering you can be pitterpattering they can be pitterpattering
Perfect
I can have pitterpattered you can have pitterpattered he can have pitterpattered we can have pitterpattered you can have pitterpattered they can have pitterpattered
V-ing perfect
I can have been pitterpattering you can have been pitterpattering he can have been pitterpattering we can have been pitterpattering you can have been pitterpattering they can have been pitterpattering
Negation
Simple form
I can't pitterpatter you can't pitterpatter he can't pitterpatter we can't pitterpatter you can't pitterpatter they can't pitterpatter
V-ing form
I can't be pitterpattering you can't be pitterpattering he can't be pitterpattering we can't be pitterpattering you can't be pitterpattering they can't be pitterpattering
Perfect
I can't have pitterpattered you can't have pitterpattered he can't have pitterpattered we can't have pitterpattered you can't have pitterpattered they can't have pitterpattered
V-ing perfect
I can't have been pitterpattering you can't have been pitterpattering he can't have been pitterpattering we can't have been pitterpattering you can't have been pitterpattering they can't have been pitterpattering
Interrogative form
Simple form
can I pitterpatter? can you pitterpatter? can he pitterpatter? can we pitterpatter? can you pitterpatter? can they pitterpatter?
V-ing form
can I be pitterpattering? can you be pitterpattering? can he be pitterpattering? can we be pitterpattering? can you be pitterpattering? can they be pitterpattering?
Perfect
can I have pitterpattered? can you have pitterpattered? can he have pitterpattered? can we have pitterpattered? can you have pitterpattered? can they have pitterpattered?
V-ing perfect
can I have been pitterpattering? can you have been pitterpattering? can he have been pitterpattering? can we have been pitterpattering? can you have been pitterpattering? can they have been pitterpattering?
Interro-negative form
Simple form
can't I pitterpatter? can't you pitterpatter? can't he pitterpatter? can't we pitterpatter? can't you pitterpatter? can't they pitterpatter?
V-ing form
can't I be pitterpattering? can't you be pitterpattering? can't he be pitterpattering? can't we be pitterpattering? can't you be pitterpattering? can't they be pitterpattering?
Perfect
can't I have pitterpattered? can't you have pitterpattered? can't he have pitterpattered? can't we have pitterpattered? can't you have pitterpattered? can't they have pitterpattered?
V-ing perfect
can't I have been pitterpattering? can't you have been pitterpattering? can't he have been pitterpattering? can't we have been pitterpattering? can't you have been pitterpattering? can't they have been pitterpattering?