I could aerate you could aerate she could aerate we could aerate you could aerate they could aerate
V-ing form
I could be aerating you could be aerating she could be aerating we could be aerating you could be aerating they could be aerating
Perfect
I could have aerated you could have aerated she could have aerated we could have aerated you could have aerated they could have aerated
V-ing perfect
I could have been aerating you could have been aerating she could have been aerating we could have been aerating you could have been aerating they could have been aerating
Negation
Simple form
I could not aerate you could not aerate she could not aerate we could not aerate you could not aerate they could not aerate
V-ing form
I could not be aerating you could not be aerating she could not be aerating we could not be aerating you could not be aerating they could not be aerating
Perfect
I could not have aerated you could not have aerated she could not have aerated we could not have aerated you could not have aerated they could not have aerated
V-ing perfect
I could not have been aerating you could not have been aerating she could not have been aerating we could not have been aerating you could not have been aerating they could not have been aerating
Interrogative form
Simple form
could I aerate? could you aerate? could she aerate? could we aerate? could you aerate? could they aerate?
V-ing form
could I be aerating? could you be aerating? could she be aerating? could we be aerating? could you be aerating? could they be aerating?
Perfect
could I have aerated? could you have aerated? could she have aerated? could we have aerated? could you have aerated? could they have aerated?
V-ing perfect
could I have been aerating? could you have been aerating? could she have been aerating? could we have been aerating? could you have been aerating? could they have been aerating?
Interro-negative form
Simple form
could I not aerate? could you not aerate? could she not aerate? could we not aerate? could you not aerate? could they not aerate?
V-ing form
could I not be aerating? could you not be aerating? could she not be aerating? could we not be aerating? could you not be aerating? could they not be aerating?
Perfect
could I not have aerated? could you not have aerated? could she not have aerated? could we not have aerated? could you not have aerated? could they not have aerated?
V-ing perfect
could I not have been aerating? could you not have been aerating? could she not have been aerating? could we not have been aerating? could you not have been aerating? could they not have been aerating?