I could find you could find she could find we could find you could find they could find
V-ing form
I could be finding you could be finding she could be finding we could be finding you could be finding they could be finding
Perfect
I could have found you could have found she could have found we could have found you could have found they could have found
V-ing perfect
I could have been finding you could have been finding she could have been finding we could have been finding you could have been finding they could have been finding
Negation
Simple form
I could not find you could not find she could not find we could not find you could not find they could not find
V-ing form
I could not be finding you could not be finding she could not be finding we could not be finding you could not be finding they could not be finding
Perfect
I could not have found you could not have found she could not have found we could not have found you could not have found they could not have found
V-ing perfect
I could not have been finding you could not have been finding she could not have been finding we could not have been finding you could not have been finding they could not have been finding
Interrogative form
Simple form
could I find? could you find? could she find? could we find? could you find? could they find?
V-ing form
could I be finding? could you be finding? could she be finding? could we be finding? could you be finding? could they be finding?
Perfect
could I have found? could you have found? could she have found? could we have found? could you have found? could they have found?
V-ing perfect
could I have been finding? could you have been finding? could she have been finding? could we have been finding? could you have been finding? could they have been finding?
Interro-negative form
Simple form
could I not find? could you not find? could she not find? could we not find? could you not find? could they not find?
V-ing form
could I not be finding? could you not be finding? could she not be finding? could we not be finding? could you not be finding? could they not be finding?
Perfect
could I not have found? could you not have found? could she not have found? could we not have found? could you not have found? could they not have found?
V-ing perfect
could I not have been finding? could you not have been finding? could she not have been finding? could we not have been finding? could you not have been finding? could they not have been finding?