could submerge
Regular verb: submerge - submerged- submerged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could submerge
you could submerge
she could submerge
we could submerge
you could submerge
they could submerge 	I could be submerging
you could be submerging
she could be submerging
we could be submerging
you could be submerging
they could be submerging	I could have submerged
you could have submerged
she could have submerged
we could have submerged
you could have submerged
they could have submerged	I could have been submerging
you could have been submerging
she could have been submerging
we could have been submerging
you could have been submerging
they could have been submerging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not submerge
you could not submerge
she could not submerge
we could not submerge
you could not submerge
they could not submerge 	I could not be submerging
you could not be submerging
she could not be submerging
we could not be submerging
you could not be submerging
they could not be submerging	I could not have submerged
you could not have submerged
she could not have submerged
we could not have submerged
you could not have submerged
they could not have submerged	I could not have been submerging
you could not have been submerging
she could not have been submerging
we could not have been submerging
you could not have been submerging
they could not have been submerging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I submerge?
could you submerge?
could she submerge?
could we submerge?
could you submerge?
could they submerge? 	could I be submerging?
could you be submerging?
could she be submerging?
could we be submerging?
could you be submerging?
could they be submerging? 	could I have submerged?
could you have submerged?
could she have submerged?
could we have submerged?
could you have submerged?
could they have submerged? 	could I have been submerging?
could you have been submerging?
could she have been submerging?
could we have been submerging?
could you have been submerging?
could they have been submerging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not submerge?
could you not submerge?
could she not submerge?
could we not submerge?
could you not submerge?
could they not submerge? 	could I not be submerging?
could you not be submerging?
could she not be submerging?
could we not be submerging?
could you not be submerging?
could they not be submerging? 	could I not have submerged?
could you not have submerged?
could she not have submerged?
could we not have submerged?
could you not have submerged?
could they not have submerged? 	could I not have been submerging?
could you not have been submerging?
could she not have been submerging?
could we not have been submerging?
could you not have been submerging?
could they not have been submerging?