I can extinguish you can extinguish she can extinguish we can extinguish you can extinguish they can extinguish
V-ing form
I can be extinguishing you can be extinguishing she can be extinguishing we can be extinguishing you can be extinguishing they can be extinguishing
Perfect
I can have extinguished you can have extinguished she can have extinguished we can have extinguished you can have extinguished they can have extinguished
V-ing perfect
I can have been extinguishing you can have been extinguishing she can have been extinguishing we can have been extinguishing you can have been extinguishing they can have been extinguishing
Negation
Simple form
I cannot extinguish you cannot extinguish she cannot extinguish we cannot extinguish you cannot extinguish they cannot extinguish
V-ing form
I cannot be extinguishing you cannot be extinguishing she cannot be extinguishing we cannot be extinguishing you cannot be extinguishing they cannot be extinguishing
Perfect
I cannot have extinguished you cannot have extinguished she cannot have extinguished we cannot have extinguished you cannot have extinguished they cannot have extinguished
V-ing perfect
I cannot have been extinguishing you cannot have been extinguishing she cannot have been extinguishing we cannot have been extinguishing you cannot have been extinguishing they cannot have been extinguishing
Interrogative form
Simple form
can I extinguish? can you extinguish? can she extinguish? can we extinguish? can you extinguish? can they extinguish?
V-ing form
can I be extinguishing? can you be extinguishing? can she be extinguishing? can we be extinguishing? can you be extinguishing? can they be extinguishing?
Perfect
can I have extinguished? can you have extinguished? can she have extinguished? can we have extinguished? can you have extinguished? can they have extinguished?
V-ing perfect
can I have been extinguishing? can you have been extinguishing? can she have been extinguishing? can we have been extinguishing? can you have been extinguishing? can they have been extinguishing?
Interro-negative form
Simple form
can I not extinguish? can you not extinguish? can she not extinguish? can we not extinguish? can you not extinguish? can they not extinguish?
V-ing form
can I not be extinguishing? can you not be extinguishing? can she not be extinguishing? can we not be extinguishing? can you not be extinguishing? can they not be extinguishing?
Perfect
can I not have extinguished? can you not have extinguished? can she not have extinguished? can we not have extinguished? can you not have extinguished? can they not have extinguished?
V-ing perfect
can I not have been extinguishing? can you not have been extinguishing? can she not have been extinguishing? can we not have been extinguishing? can you not have been extinguishing? can they not have been extinguishing?