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