I could alleviate you could alleviate he could alleviate we could alleviate you could alleviate they could alleviate
V-ing form
I could be alleviating you could be alleviating he could be alleviating we could be alleviating you could be alleviating they could be alleviating
Perfect
I could have alleviated you could have alleviated he could have alleviated we could have alleviated you could have alleviated they could have alleviated
V-ing perfect
I could have been alleviating you could have been alleviating he could have been alleviating we could have been alleviating you could have been alleviating they could have been alleviating
Negation
Simple form
I couldn't alleviate you couldn't alleviate he couldn't alleviate we couldn't alleviate you couldn't alleviate they couldn't alleviate
V-ing form
I couldn't be alleviating you couldn't be alleviating he couldn't be alleviating we couldn't be alleviating you couldn't be alleviating they couldn't be alleviating
Perfect
I couldn't have alleviated you couldn't have alleviated he couldn't have alleviated we couldn't have alleviated you couldn't have alleviated they couldn't have alleviated
V-ing perfect
I couldn't have been alleviating you couldn't have been alleviating he couldn't have been alleviating we couldn't have been alleviating you couldn't have been alleviating they couldn't have been alleviating
Interrogative form
Simple form
could I alleviate? could you alleviate? could he alleviate? could we alleviate? could you alleviate? could they alleviate?
V-ing form
could I be alleviating? could you be alleviating? could he be alleviating? could we be alleviating? could you be alleviating? could they be alleviating?
Perfect
could I have alleviated? could you have alleviated? could he have alleviated? could we have alleviated? could you have alleviated? could they have alleviated?
V-ing perfect
could I have been alleviating? could you have been alleviating? could he have been alleviating? could we have been alleviating? could you have been alleviating? could they have been alleviating?
Interro-negative form
Simple form
couldn't I alleviate? couldn't you alleviate? couldn't he alleviate? couldn't we alleviate? couldn't you alleviate? couldn't they alleviate?
V-ing form
couldn't I be alleviating? couldn't you be alleviating? couldn't he be alleviating? couldn't we be alleviating? couldn't you be alleviating? couldn't they be alleviating?
Perfect
couldn't I have alleviated? couldn't you have alleviated? couldn't he have alleviated? couldn't we have alleviated? couldn't you have alleviated? couldn't they have alleviated?
V-ing perfect
couldn't I have been alleviating? couldn't you have been alleviating? couldn't he have been alleviating? couldn't we have been alleviating? couldn't you have been alleviating? couldn't they have been alleviating?