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