could treat
Regular verb: treat - treated- treated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could treat
you could treat
she could treat
we could treat
you could treat
they could treat 	I could be treating
you could be treating
she could be treating
we could be treating
you could be treating
they could be treating	I could have treated
you could have treated
she could have treated
we could have treated
you could have treated
they could have treated	I could have been treating
you could have been treating
she could have been treating
we could have been treating
you could have been treating
they could have been treating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't treat
you couldn't treat
she couldn't treat
we couldn't treat
you couldn't treat
they couldn't treat 	I couldn't be treating
you couldn't be treating
she couldn't be treating
we couldn't be treating
you couldn't be treating
they couldn't be treating	I couldn't have treated
you couldn't have treated
she couldn't have treated
we couldn't have treated
you couldn't have treated
they couldn't have treated	I couldn't have been treating
you couldn't have been treating
she couldn't have been treating
we couldn't have been treating
you couldn't have been treating
they couldn't have been treating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I treat?
could you treat?
could she treat?
could we treat?
could you treat?
could they treat? 	could I be treating?
could you be treating?
could she be treating?
could we be treating?
could you be treating?
could they be treating? 	could I have treated?
could you have treated?
could she have treated?
could we have treated?
could you have treated?
could they have treated? 	could I have been treating?
could you have been treating?
could she have been treating?
could we have been treating?
could you have been treating?
could they have been treating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I treat?
couldn't you treat?
couldn't she treat?
couldn't we treat?
couldn't you treat?
couldn't they treat? 	couldn't I be treating?
couldn't you be treating?
couldn't she be treating?
couldn't we be treating?
couldn't you be treating?
couldn't they be treating? 	couldn't I have treated?
couldn't you have treated?
couldn't she have treated?
couldn't we have treated?
couldn't you have treated?
couldn't they have treated? 	couldn't I have been treating?
couldn't you have been treating?
couldn't she have been treating?
couldn't we have been treating?
couldn't you have been treating?
couldn't they have been treating?