could escalate
Regular verb: escalate - escalated- escalated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could escalate
you could escalate
she could escalate
we could escalate
you could escalate
they could escalate 	I could be escalating
you could be escalating
she could be escalating
we could be escalating
you could be escalating
they could be escalating	I could have escalated
you could have escalated
she could have escalated
we could have escalated
you could have escalated
they could have escalated	I could have been escalating
you could have been escalating
she could have been escalating
we could have been escalating
you could have been escalating
they could have been escalating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't escalate
you couldn't escalate
she couldn't escalate
we couldn't escalate
you couldn't escalate
they couldn't escalate 	I couldn't be escalating
you couldn't be escalating
she couldn't be escalating
we couldn't be escalating
you couldn't be escalating
they couldn't be escalating	I couldn't have escalated
you couldn't have escalated
she couldn't have escalated
we couldn't have escalated
you couldn't have escalated
they couldn't have escalated	I couldn't have been escalating
you couldn't have been escalating
she couldn't have been escalating
we couldn't have been escalating
you couldn't have been escalating
they couldn't have been escalating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I escalate?
could you escalate?
could she escalate?
could we escalate?
could you escalate?
could they escalate? 	could I be escalating?
could you be escalating?
could she be escalating?
could we be escalating?
could you be escalating?
could they be escalating? 	could I have escalated?
could you have escalated?
could she have escalated?
could we have escalated?
could you have escalated?
could they have escalated? 	could I have been escalating?
could you have been escalating?
could she have been escalating?
could we have been escalating?
could you have been escalating?
could they have been escalating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I escalate?
couldn't you escalate?
couldn't she escalate?
couldn't we escalate?
couldn't you escalate?
couldn't they escalate? 	couldn't I be escalating?
couldn't you be escalating?
couldn't she be escalating?
couldn't we be escalating?
couldn't you be escalating?
couldn't they be escalating? 	couldn't I have escalated?
couldn't you have escalated?
couldn't she have escalated?
couldn't we have escalated?
couldn't you have escalated?
couldn't they have escalated? 	couldn't I have been escalating?
couldn't you have been escalating?
couldn't she have been escalating?
couldn't we have been escalating?
couldn't you have been escalating?
couldn't they have been escalating?