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