can deepen
Regular verb: deepen - deepened- deepened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can deepen
you can deepen
he can deepen
we can deepen
you can deepen
they can deepen 	I can be deepening
you can be deepening
he can be deepening
we can be deepening
you can be deepening
they can be deepening	I can have deepened
you can have deepened
he can have deepened
we can have deepened
you can have deepened
they can have deepened	I can have been deepening
you can have been deepening
he can have been deepening
we can have been deepening
you can have been deepening
they can have been deepening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't deepen
you can't deepen
he can't deepen
we can't deepen
you can't deepen
they can't deepen 	I can't be deepening
you can't be deepening
he can't be deepening
we can't be deepening
you can't be deepening
they can't be deepening	I can't have deepened
you can't have deepened
he can't have deepened
we can't have deepened
you can't have deepened
they can't have deepened	I can't have been deepening
you can't have been deepening
he can't have been deepening
we can't have been deepening
you can't have been deepening
they can't have been deepening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I deepen?
can you deepen?
can he deepen?
can we deepen?
can you deepen?
can they deepen? 	can I be deepening?
can you be deepening?
can he be deepening?
can we be deepening?
can you be deepening?
can they be deepening? 	can I have deepened?
can you have deepened?
can he have deepened?
can we have deepened?
can you have deepened?
can they have deepened? 	can I have been deepening?
can you have been deepening?
can he have been deepening?
can we have been deepening?
can you have been deepening?
can they have been deepening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I deepen?
can't you deepen?
can't he deepen?
can't we deepen?
can't you deepen?
can't they deepen? 	can't I be deepening?
can't you be deepening?
can't he be deepening?
can't we be deepening?
can't you be deepening?
can't they be deepening? 	can't I have deepened?
can't you have deepened?
can't he have deepened?
can't we have deepened?
can't you have deepened?
can't they have deepened? 	can't I have been deepening?
can't you have been deepening?
can't he have been deepening?
can't we have been deepening?
can't you have been deepening?
can't they have been deepening?