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