I could sate you could sate she could sate we could sate you could sate they could sate
V-ing form
I could be sating you could be sating she could be sating we could be sating you could be sating they could be sating
Perfect
I could have sated you could have sated she 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 she 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 she 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 she 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 she 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 she 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 she sate? could we sate? could you sate? could they sate?
V-ing form
could I be sating? could you be sating? could she be sating? could we be sating? could you be sating? could they be sating?
Perfect
could I have sated? could you have sated? could she 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 she 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 she 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 she 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 she 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 she have been sating? couldn't we have been sating? couldn't you have been sating? couldn't they have been sating?