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