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