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