could pretreat
Regular verb: pretreat - pretreated- pretreated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could pretreat
you could pretreat
he could pretreat
we could pretreat
you could pretreat
they could pretreat 	I could be pretreating
you could be pretreating
he could be pretreating
we could be pretreating
you could be pretreating
they could be pretreating	I could have pretreated
you could have pretreated
he could have pretreated
we could have pretreated
you could have pretreated
they could have pretreated	I could have been pretreating
you could have been pretreating
he could have been pretreating
we could have been pretreating
you could have been pretreating
they could have been pretreating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not pretreat
you could not pretreat
he could not pretreat
we could not pretreat
you could not pretreat
they could not pretreat 	I could not be pretreating
you could not be pretreating
he could not be pretreating
we could not be pretreating
you could not be pretreating
they could not be pretreating	I could not have pretreated
you could not have pretreated
he could not have pretreated
we could not have pretreated
you could not have pretreated
they could not have pretreated	I could not have been pretreating
you could not have been pretreating
he could not have been pretreating
we could not have been pretreating
you could not have been pretreating
they could not have been pretreating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I pretreat?
could you pretreat?
could he pretreat?
could we pretreat?
could you pretreat?
could they pretreat? 	could I be pretreating?
could you be pretreating?
could he be pretreating?
could we be pretreating?
could you be pretreating?
could they be pretreating? 	could I have pretreated?
could you have pretreated?
could he have pretreated?
could we have pretreated?
could you have pretreated?
could they have pretreated? 	could I have been pretreating?
could you have been pretreating?
could he have been pretreating?
could we have been pretreating?
could you have been pretreating?
could they have been pretreating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not pretreat?
could you not pretreat?
could he not pretreat?
could we not pretreat?
could you not pretreat?
could they not pretreat? 	could I not be pretreating?
could you not be pretreating?
could he not be pretreating?
could we not be pretreating?
could you not be pretreating?
could they not be pretreating? 	could I not have pretreated?
could you not have pretreated?
could he not have pretreated?
could we not have pretreated?
could you not have pretreated?
could they not have pretreated? 	could I not have been pretreating?
could you not have been pretreating?
could he not have been pretreating?
could we not have been pretreating?
could you not have been pretreating?
could they not have been pretreating?