could tooth
Regular verb: tooth - toothed- toothed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could tooth
you could tooth
she could tooth
we could tooth
you could tooth
they could tooth 	I could be toothing
you could be toothing
she could be toothing
we could be toothing
you could be toothing
they could be toothing	I could have toothed
you could have toothed
she could have toothed
we could have toothed
you could have toothed
they could have toothed	I could have been toothing
you could have been toothing
she could have been toothing
we could have been toothing
you could have been toothing
they could have been toothing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't tooth
you couldn't tooth
she couldn't tooth
we couldn't tooth
you couldn't tooth
they couldn't tooth 	I couldn't be toothing
you couldn't be toothing
she couldn't be toothing
we couldn't be toothing
you couldn't be toothing
they couldn't be toothing	I couldn't have toothed
you couldn't have toothed
she couldn't have toothed
we couldn't have toothed
you couldn't have toothed
they couldn't have toothed	I couldn't have been toothing
you couldn't have been toothing
she couldn't have been toothing
we couldn't have been toothing
you couldn't have been toothing
they couldn't have been toothing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I tooth?
could you tooth?
could she tooth?
could we tooth?
could you tooth?
could they tooth? 	could I be toothing?
could you be toothing?
could she be toothing?
could we be toothing?
could you be toothing?
could they be toothing? 	could I have toothed?
could you have toothed?
could she have toothed?
could we have toothed?
could you have toothed?
could they have toothed? 	could I have been toothing?
could you have been toothing?
could she have been toothing?
could we have been toothing?
could you have been toothing?
could they have been toothing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I tooth?
couldn't you tooth?
couldn't she tooth?
couldn't we tooth?
couldn't you tooth?
couldn't they tooth? 	couldn't I be toothing?
couldn't you be toothing?
couldn't she be toothing?
couldn't we be toothing?
couldn't you be toothing?
couldn't they be toothing? 	couldn't I have toothed?
couldn't you have toothed?
couldn't she have toothed?
couldn't we have toothed?
couldn't you have toothed?
couldn't they have toothed? 	couldn't I have been toothing?
couldn't you have been toothing?
couldn't she have been toothing?
couldn't we have been toothing?
couldn't you have been toothing?
couldn't they have been toothing?