can dam
Regular verb: dam - dammed- dammed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can dam
you can dam
he can dam
we can dam
you can dam
they can dam 	I can be damming
you can be damming
he can be damming
we can be damming
you can be damming
they can be damming	I can have dammed
you can have dammed
he can have dammed
we can have dammed
you can have dammed
they can have dammed	I can have been damming
you can have been damming
he can have been damming
we can have been damming
you can have been damming
they can have been damming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't dam
you can't dam
he can't dam
we can't dam
you can't dam
they can't dam 	I can't be damming
you can't be damming
he can't be damming
we can't be damming
you can't be damming
they can't be damming	I can't have dammed
you can't have dammed
he can't have dammed
we can't have dammed
you can't have dammed
they can't have dammed	I can't have been damming
you can't have been damming
he can't have been damming
we can't have been damming
you can't have been damming
they can't have been damming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I dam?
can you dam?
can he dam?
can we dam?
can you dam?
can they dam? 	can I be damming?
can you be damming?
can he be damming?
can we be damming?
can you be damming?
can they be damming? 	can I have dammed?
can you have dammed?
can he have dammed?
can we have dammed?
can you have dammed?
can they have dammed? 	can I have been damming?
can you have been damming?
can he have been damming?
can we have been damming?
can you have been damming?
can they have been damming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I dam?
can't you dam?
can't he dam?
can't we dam?
can't you dam?
can't they dam? 	can't I be damming?
can't you be damming?
can't he be damming?
can't we be damming?
can't you be damming?
can't they be damming? 	can't I have dammed?
can't you have dammed?
can't he have dammed?
can't we have dammed?
can't you have dammed?
can't they have dammed? 	can't I have been damming?
can't you have been damming?
can't he have been damming?
can't we have been damming?
can't you have been damming?
can't they have been damming?