I could culminate you could culminate she could culminate we could culminate you could culminate they could culminate
V-ing form
I could be culminating you could be culminating she could be culminating we could be culminating you could be culminating they could be culminating
Perfect
I could have culminated you could have culminated she could have culminated we could have culminated you could have culminated they could have culminated
V-ing perfect
I could have been culminating you could have been culminating she could have been culminating we could have been culminating you could have been culminating they could have been culminating
Negation
Simple form
I couldn't culminate you couldn't culminate she couldn't culminate we couldn't culminate you couldn't culminate they couldn't culminate
V-ing form
I couldn't be culminating you couldn't be culminating she couldn't be culminating we couldn't be culminating you couldn't be culminating they couldn't be culminating
Perfect
I couldn't have culminated you couldn't have culminated she couldn't have culminated we couldn't have culminated you couldn't have culminated they couldn't have culminated
V-ing perfect
I couldn't have been culminating you couldn't have been culminating she couldn't have been culminating we couldn't have been culminating you couldn't have been culminating they couldn't have been culminating
Interrogative form
Simple form
could I culminate? could you culminate? could she culminate? could we culminate? could you culminate? could they culminate?
V-ing form
could I be culminating? could you be culminating? could she be culminating? could we be culminating? could you be culminating? could they be culminating?
Perfect
could I have culminated? could you have culminated? could she have culminated? could we have culminated? could you have culminated? could they have culminated?
V-ing perfect
could I have been culminating? could you have been culminating? could she have been culminating? could we have been culminating? could you have been culminating? could they have been culminating?
Interro-negative form
Simple form
couldn't I culminate? couldn't you culminate? couldn't she culminate? couldn't we culminate? couldn't you culminate? couldn't they culminate?
V-ing form
couldn't I be culminating? couldn't you be culminating? couldn't she be culminating? couldn't we be culminating? couldn't you be culminating? couldn't they be culminating?
Perfect
couldn't I have culminated? couldn't you have culminated? couldn't she have culminated? couldn't we have culminated? couldn't you have culminated? couldn't they have culminated?
V-ing perfect
couldn't I have been culminating? couldn't you have been culminating? couldn't she have been culminating? couldn't we have been culminating? couldn't you have been culminating? couldn't they have been culminating?