I can birdie you can birdie she can birdie we can birdie you can birdie they can birdie
V-ing form
I can be birdying you can be birdying she can be birdying we can be birdying you can be birdying they can be birdying
Perfect
I can have birdied you can have birdied she can have birdied we can have birdied you can have birdied they can have birdied
V-ing perfect
I can have been birdying you can have been birdying she can have been birdying we can have been birdying you can have been birdying they can have been birdying
Negation
Simple form
I cannot birdie you cannot birdie she cannot birdie we cannot birdie you cannot birdie they cannot birdie
V-ing form
I cannot be birdying you cannot be birdying she cannot be birdying we cannot be birdying you cannot be birdying they cannot be birdying
Perfect
I cannot have birdied you cannot have birdied she cannot have birdied we cannot have birdied you cannot have birdied they cannot have birdied
V-ing perfect
I cannot have been birdying you cannot have been birdying she cannot have been birdying we cannot have been birdying you cannot have been birdying they cannot have been birdying
Interrogative form
Simple form
can I birdie? can you birdie? can she birdie? can we birdie? can you birdie? can they birdie?
V-ing form
can I be birdying? can you be birdying? can she be birdying? can we be birdying? can you be birdying? can they be birdying?
Perfect
can I have birdied? can you have birdied? can she have birdied? can we have birdied? can you have birdied? can they have birdied?
V-ing perfect
can I have been birdying? can you have been birdying? can she have been birdying? can we have been birdying? can you have been birdying? can they have been birdying?
Interro-negative form
Simple form
can I not birdie? can you not birdie? can she not birdie? can we not birdie? can you not birdie? can they not birdie?
V-ing form
can I not be birdying? can you not be birdying? can she not be birdying? can we not be birdying? can you not be birdying? can they not be birdying?
Perfect
can I not have birdied? can you not have birdied? can she not have birdied? can we not have birdied? can you not have birdied? can they not have birdied?
V-ing perfect
can I not have been birdying? can you not have been birdying? can she not have been birdying? can we not have been birdying? can you not have been birdying? can they not have been birdying?