could tap
Regular verb: tap - tapped- tapped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could tap
you could tap
he could tap
we could tap
you could tap
they could tap 	I could be tapping
you could be tapping
he could be tapping
we could be tapping
you could be tapping
they could be tapping	I could have tapped
you could have tapped
he could have tapped
we could have tapped
you could have tapped
they could have tapped	I could have been tapping
you could have been tapping
he could have been tapping
we could have been tapping
you could have been tapping
they could have been tapping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't tap
you couldn't tap
he couldn't tap
we couldn't tap
you couldn't tap
they couldn't tap 	I couldn't be tapping
you couldn't be tapping
he couldn't be tapping
we couldn't be tapping
you couldn't be tapping
they couldn't be tapping	I couldn't have tapped
you couldn't have tapped
he couldn't have tapped
we couldn't have tapped
you couldn't have tapped
they couldn't have tapped	I couldn't have been tapping
you couldn't have been tapping
he couldn't have been tapping
we couldn't have been tapping
you couldn't have been tapping
they couldn't have been tapping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I tap?
could you tap?
could he tap?
could we tap?
could you tap?
could they tap? 	could I be tapping?
could you be tapping?
could he be tapping?
could we be tapping?
could you be tapping?
could they be tapping? 	could I have tapped?
could you have tapped?
could he have tapped?
could we have tapped?
could you have tapped?
could they have tapped? 	could I have been tapping?
could you have been tapping?
could he have been tapping?
could we have been tapping?
could you have been tapping?
could they have been tapping? 	

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