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