I can pitterpatter you can pitterpatter she can pitterpatter we can pitterpatter you can pitterpatter they can pitterpatter
V-ing form
I can be pitterpattering you can be pitterpattering she can be pitterpattering we can be pitterpattering you can be pitterpattering they can be pitterpattering
Perfect
I can have pitterpattered you can have pitterpattered she 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 she can have been pitterpattering we can have been pitterpattering you can have been pitterpattering they can have been pitterpattering
Negation
Simple form
I cannot pitterpatter you cannot pitterpatter she cannot pitterpatter we cannot pitterpatter you cannot pitterpatter they cannot pitterpatter
V-ing form
I cannot be pitterpattering you cannot be pitterpattering she cannot be pitterpattering we cannot be pitterpattering you cannot be pitterpattering they cannot be pitterpattering
Perfect
I cannot have pitterpattered you cannot have pitterpattered she cannot have pitterpattered we cannot have pitterpattered you cannot have pitterpattered they cannot have pitterpattered
V-ing perfect
I cannot have been pitterpattering you cannot have been pitterpattering she cannot have been pitterpattering we cannot have been pitterpattering you cannot have been pitterpattering they cannot have been pitterpattering
Interrogative form
Simple form
can I pitterpatter? can you pitterpatter? can she pitterpatter? can we pitterpatter? can you pitterpatter? can they pitterpatter?
V-ing form
can I be pitterpattering? can you be pitterpattering? can she be pitterpattering? can we be pitterpattering? can you be pitterpattering? can they be pitterpattering?
Perfect
can I have pitterpattered? can you have pitterpattered? can she 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 she have been pitterpattering? can we have been pitterpattering? can you have been pitterpattering? can they have been pitterpattering?
Interro-negative form
Simple form
can I not pitterpatter? can you not pitterpatter? can she not pitterpatter? can we not pitterpatter? can you not pitterpatter? can they not pitterpatter?
V-ing form
can I not be pitterpattering? can you not be pitterpattering? can she not be pitterpattering? can we not be pitterpattering? can you not be pitterpattering? can they not be pitterpattering?
Perfect
can I not have pitterpattered? can you not have pitterpattered? can she not have pitterpattered? can we not have pitterpattered? can you not have pitterpattered? can they not have pitterpattered?
V-ing perfect
can I not have been pitterpattering? can you not have been pitterpattering? can she not have been pitterpattering? can we not have been pitterpattering? can you not have been pitterpattering? can they not have been pitterpattering?