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 couldn't find you couldn't find she couldn't find we couldn't find you couldn't find they couldn't find
V-ing form
I couldn't be finding you couldn't be finding she couldn't be finding we couldn't be finding you couldn't be finding they couldn't be finding
Perfect
I couldn't have found you couldn't have found she couldn't have found we couldn't have found you couldn't have found they couldn't have found
V-ing perfect
I couldn't have been finding you couldn't have been finding she couldn't have been finding we couldn't have been finding you couldn't have been finding they couldn't 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
couldn't I find? couldn't you find? couldn't she find? couldn't we find? couldn't you find? couldn't they find?
V-ing form
couldn't I be finding? couldn't you be finding? couldn't she be finding? couldn't we be finding? couldn't you be finding? couldn't they be finding?
Perfect
couldn't I have found? couldn't you have found? couldn't she have found? couldn't we have found? couldn't you have found? couldn't they have found?
V-ing perfect
couldn't I have been finding? couldn't you have been finding? couldn't she have been finding? couldn't we have been finding? couldn't you have been finding? couldn't they have been finding?