can board
Regular verb: board - boarded- boarded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can board
you can board
he can board
we can board
you can board
they can board 	I can be boarding
you can be boarding
he can be boarding
we can be boarding
you can be boarding
they can be boarding	I can have boarded
you can have boarded
he can have boarded
we can have boarded
you can have boarded
they can have boarded	I can have been boarding
you can have been boarding
he can have been boarding
we can have been boarding
you can have been boarding
they can have been boarding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't board
you can't board
he can't board
we can't board
you can't board
they can't board 	I can't be boarding
you can't be boarding
he can't be boarding
we can't be boarding
you can't be boarding
they can't be boarding	I can't have boarded
you can't have boarded
he can't have boarded
we can't have boarded
you can't have boarded
they can't have boarded	I can't have been boarding
you can't have been boarding
he can't have been boarding
we can't have been boarding
you can't have been boarding
they can't have been boarding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I board?
can you board?
can he board?
can we board?
can you board?
can they board? 	can I be boarding?
can you be boarding?
can he be boarding?
can we be boarding?
can you be boarding?
can they be boarding? 	can I have boarded?
can you have boarded?
can he have boarded?
can we have boarded?
can you have boarded?
can they have boarded? 	can I have been boarding?
can you have been boarding?
can he have been boarding?
can we have been boarding?
can you have been boarding?
can they have been boarding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I board?
can't you board?
can't he board?
can't we board?
can't you board?
can't they board? 	can't I be boarding?
can't you be boarding?
can't he be boarding?
can't we be boarding?
can't you be boarding?
can't they be boarding? 	can't I have boarded?
can't you have boarded?
can't he have boarded?
can't we have boarded?
can't you have boarded?
can't they have boarded? 	can't I have been boarding?
can't you have been boarding?
can't he have been boarding?
can't we have been boarding?
can't you have been boarding?
can't they have been boarding?