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