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