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