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 could not preeducate you could not preeducate he could not preeducate we could not preeducate you could not preeducate they could not preeducate
V-ing form
I could not be preeducating you could not be preeducating he could not be preeducating we could not be preeducating you could not be preeducating they could not be preeducating
Perfect
I could not have preeducated you could not have preeducated he could not have preeducated we could not have preeducated you could not have preeducated they could not have preeducated
V-ing perfect
I could not have been preeducating you could not have been preeducating he could not have been preeducating we could not have been preeducating you could not have been preeducating they could not 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
could I not preeducate? could you not preeducate? could he not preeducate? could we not preeducate? could you not preeducate? could they not preeducate?
V-ing form
could I not be preeducating? could you not be preeducating? could he not be preeducating? could we not be preeducating? could you not be preeducating? could they not be preeducating?
Perfect
could I not have preeducated? could you not have preeducated? could he not have preeducated? could we not have preeducated? could you not have preeducated? could they not have preeducated?
V-ing perfect
could I not have been preeducating? could you not have been preeducating? could he not have been preeducating? could we not have been preeducating? could you not have been preeducating? could they not have been preeducating?