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 cannot deepen
you cannot deepen
he cannot deepen
we cannot deepen
you cannot deepen
they cannot deepen 	I cannot be deepening
you cannot be deepening
he cannot be deepening
we cannot be deepening
you cannot be deepening
they cannot be deepening	I cannot have deepened
you cannot have deepened
he cannot have deepened
we cannot have deepened
you cannot have deepened
they cannot have deepened	I cannot have been deepening
you cannot have been deepening
he cannot have been deepening
we cannot have been deepening
you cannot have been deepening
they cannot 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 I not deepen?
can you not deepen?
can he not deepen?
can we not deepen?
can you not deepen?
can they not deepen? 	can I not be deepening?
can you not be deepening?
can he not be deepening?
can we not be deepening?
can you not be deepening?
can they not be deepening? 	can I not have deepened?
can you not have deepened?
can he not have deepened?
can we not have deepened?
can you not have deepened?
can they not have deepened? 	can I not have been deepening?
can you not have been deepening?
can he not have been deepening?
can we not have been deepening?
can you not have been deepening?
can they not have been deepening?