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 could not treat
you could not treat
she could not treat
we could not treat
you could not treat
they could not treat 	I could not be treating
you could not be treating
she could not be treating
we could not be treating
you could not be treating
they could not be treating	I could not have treated
you could not have treated
she could not have treated
we could not have treated
you could not have treated
they could not have treated	I could not have been treating
you could not have been treating
she could not have been treating
we could not have been treating
you could not have been treating
they could not 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 	
could I not treat?
could you not treat?
could she not treat?
could we not treat?
could you not treat?
could they not treat? 	could I not be treating?
could you not be treating?
could she not be treating?
could we not be treating?
could you not be treating?
could they not be treating? 	could I not have treated?
could you not have treated?
could she not have treated?
could we not have treated?
could you not have treated?
could they not have treated? 	could I not have been treating?
could you not have been treating?
could she not have been treating?
could we not have been treating?
could you not have been treating?
could they not have been treating?