can mast
Regular verb: mast - masted- masted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can mast
you can mast
she can mast
we can mast
you can mast
they can mast 	I can be masting
you can be masting
she can be masting
we can be masting
you can be masting
they can be masting	I can have masted
you can have masted
she can have masted
we can have masted
you can have masted
they can have masted	I can have been masting
you can have been masting
she can have been masting
we can have been masting
you can have been masting
they can have been masting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't mast
you can't mast
she can't mast
we can't mast
you can't mast
they can't mast 	I can't be masting
you can't be masting
she can't be masting
we can't be masting
you can't be masting
they can't be masting	I can't have masted
you can't have masted
she can't have masted
we can't have masted
you can't have masted
they can't have masted	I can't have been masting
you can't have been masting
she can't have been masting
we can't have been masting
you can't have been masting
they can't have been masting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I mast?
can you mast?
can she mast?
can we mast?
can you mast?
can they mast? 	can I be masting?
can you be masting?
can she be masting?
can we be masting?
can you be masting?
can they be masting? 	can I have masted?
can you have masted?
can she have masted?
can we have masted?
can you have masted?
can they have masted? 	can I have been masting?
can you have been masting?
can she have been masting?
can we have been masting?
can you have been masting?
can they have been masting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I mast?
can't you mast?
can't she mast?
can't we mast?
can't you mast?
can't they mast? 	can't I be masting?
can't you be masting?
can't she be masting?
can't we be masting?
can't you be masting?
can't they be masting? 	can't I have masted?
can't you have masted?
can't she have masted?
can't we have masted?
can't you have masted?
can't they have masted? 	can't I have been masting?
can't you have been masting?
can't she have been masting?
can't we have been masting?
can't you have been masting?
can't they have been masting?