I can tap you can tap he can tap we can tap you can tap they can tap
V-ing form
I can be tapping you can be tapping he can be tapping we can be tapping you can be tapping they can be tapping
Perfect
I can have tapped you can have tapped he can have tapped we can have tapped you can have tapped they can have tapped
V-ing perfect
I can have been tapping you can have been tapping he can have been tapping we can have been tapping you can have been tapping they can have been tapping
Negation
Simple form
I can't tap you can't tap he can't tap we can't tap you can't tap they can't tap
V-ing form
I can't be tapping you can't be tapping he can't be tapping we can't be tapping you can't be tapping they can't be tapping
Perfect
I can't have tapped you can't have tapped he can't have tapped we can't have tapped you can't have tapped they can't have tapped
V-ing perfect
I can't have been tapping you can't have been tapping he can't have been tapping we can't have been tapping you can't have been tapping they can't have been tapping
Interrogative form
Simple form
can I tap? can you tap? can he tap? can we tap? can you tap? can they tap?
V-ing form
can I be tapping? can you be tapping? can he be tapping? can we be tapping? can you be tapping? can they be tapping?
Perfect
can I have tapped? can you have tapped? can he have tapped? can we have tapped? can you have tapped? can they have tapped?
V-ing perfect
can I have been tapping? can you have been tapping? can he have been tapping? can we have been tapping? can you have been tapping? can they have been tapping?
Interro-negative form
Simple form
can't I tap? can't you tap? can't he tap? can't we tap? can't you tap? can't they tap?
V-ing form
can't I be tapping? can't you be tapping? can't he be tapping? can't we be tapping? can't you be tapping? can't they be tapping?
Perfect
can't I have tapped? can't you have tapped? can't he have tapped? can't we have tapped? can't you have tapped? can't they have tapped?
V-ing perfect
can't I have been tapping? can't you have been tapping? can't he have been tapping? can't we have been tapping? can't you have been tapping? can't they have been tapping?