I could determine you could determine he could determine we could determine you could determine they could determine
V-ing form
I could be determining you could be determining he could be determining we could be determining you could be determining they could be determining
Perfect
I could have determined you could have determined he could have determined we could have determined you could have determined they could have determined
V-ing perfect
I could have been determining you could have been determining he could have been determining we could have been determining you could have been determining they could have been determining
Negation
Simple form
I couldn't determine you couldn't determine he couldn't determine we couldn't determine you couldn't determine they couldn't determine
V-ing form
I couldn't be determining you couldn't be determining he couldn't be determining we couldn't be determining you couldn't be determining they couldn't be determining
Perfect
I couldn't have determined you couldn't have determined he couldn't have determined we couldn't have determined you couldn't have determined they couldn't have determined
V-ing perfect
I couldn't have been determining you couldn't have been determining he couldn't have been determining we couldn't have been determining you couldn't have been determining they couldn't have been determining
Interrogative form
Simple form
could I determine? could you determine? could he determine? could we determine? could you determine? could they determine?
V-ing form
could I be determining? could you be determining? could he be determining? could we be determining? could you be determining? could they be determining?
Perfect
could I have determined? could you have determined? could he have determined? could we have determined? could you have determined? could they have determined?
V-ing perfect
could I have been determining? could you have been determining? could he have been determining? could we have been determining? could you have been determining? could they have been determining?
Interro-negative form
Simple form
couldn't I determine? couldn't you determine? couldn't he determine? couldn't we determine? couldn't you determine? couldn't they determine?
V-ing form
couldn't I be determining? couldn't you be determining? couldn't he be determining? couldn't we be determining? couldn't you be determining? couldn't they be determining?
Perfect
couldn't I have determined? couldn't you have determined? couldn't he have determined? couldn't we have determined? couldn't you have determined? couldn't they have determined?
V-ing perfect
couldn't I have been determining? couldn't you have been determining? couldn't he have been determining? couldn't we have been determining? couldn't you have been determining? couldn't they have been determining?