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 cannot pitterpatter you cannot pitterpatter he cannot pitterpatter we cannot pitterpatter you cannot pitterpatter they cannot pitterpatter
V-ing form
I cannot be pitterpattering you cannot be pitterpattering he cannot be pitterpattering we cannot be pitterpattering you cannot be pitterpattering they cannot be pitterpattering
Perfect
I cannot have pitterpattered you cannot have pitterpattered he 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 he 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 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 I not pitterpatter? can you not pitterpatter? can he 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 he 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 he 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 he not have been pitterpattering? can we not have been pitterpattering? can you not have been pitterpattering? can they not have been pitterpattering?