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