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 cannot board
you cannot board
he cannot board
we cannot board
you cannot board
they cannot board 	I cannot be boarding
you cannot be boarding
he cannot be boarding
we cannot be boarding
you cannot be boarding
they cannot be boarding	I cannot have boarded
you cannot have boarded
he cannot have boarded
we cannot have boarded
you cannot have boarded
they cannot have boarded	I cannot have been boarding
you cannot have been boarding
he cannot have been boarding
we cannot have been boarding
you cannot have been boarding
they cannot 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 I not board?
can you not board?
can he not board?
can we not board?
can you not board?
can they not board? 	can I not be boarding?
can you not be boarding?
can he not be boarding?
can we not be boarding?
can you not be boarding?
can they not be boarding? 	can I not have boarded?
can you not have boarded?
can he not have boarded?
can we not have boarded?
can you not have boarded?
can they not have boarded? 	can I not have been boarding?
can you not have been boarding?
can he not have been boarding?
can we not have been boarding?
can you not have been boarding?
can they not have been boarding?