could deterge
Regular verb: deterge - deterged- deterged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could deterge
you could deterge
she could deterge
we could deterge
you could deterge
they could deterge 	I could be deterging
you could be deterging
she could be deterging
we could be deterging
you could be deterging
they could be deterging	I could have deterged
you could have deterged
she could have deterged
we could have deterged
you could have deterged
they could have deterged	I could have been deterging
you could have been deterging
she could have been deterging
we could have been deterging
you could have been deterging
they could have been deterging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't deterge
you couldn't deterge
she couldn't deterge
we couldn't deterge
you couldn't deterge
they couldn't deterge 	I couldn't be deterging
you couldn't be deterging
she couldn't be deterging
we couldn't be deterging
you couldn't be deterging
they couldn't be deterging	I couldn't have deterged
you couldn't have deterged
she couldn't have deterged
we couldn't have deterged
you couldn't have deterged
they couldn't have deterged	I couldn't have been deterging
you couldn't have been deterging
she couldn't have been deterging
we couldn't have been deterging
you couldn't have been deterging
they couldn't have been deterging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I deterge?
could you deterge?
could she deterge?
could we deterge?
could you deterge?
could they deterge? 	could I be deterging?
could you be deterging?
could she be deterging?
could we be deterging?
could you be deterging?
could they be deterging? 	could I have deterged?
could you have deterged?
could she have deterged?
could we have deterged?
could you have deterged?
could they have deterged? 	could I have been deterging?
could you have been deterging?
could she have been deterging?
could we have been deterging?
could you have been deterging?
could they have been deterging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I deterge?
couldn't you deterge?
couldn't she deterge?
couldn't we deterge?
couldn't you deterge?
couldn't they deterge? 	couldn't I be deterging?
couldn't you be deterging?
couldn't she be deterging?
couldn't we be deterging?
couldn't you be deterging?
couldn't they be deterging? 	couldn't I have deterged?
couldn't you have deterged?
couldn't she have deterged?
couldn't we have deterged?
couldn't you have deterged?
couldn't they have deterged? 	couldn't I have been deterging?
couldn't you have been deterging?
couldn't she have been deterging?
couldn't we have been deterging?
couldn't you have been deterging?
couldn't they have been deterging?