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