I can extinguish you can extinguish he can extinguish we can extinguish you can extinguish they can extinguish
V-ing form
I can be extinguishing you can be extinguishing he can be extinguishing we can be extinguishing you can be extinguishing they can be extinguishing
Perfect
I can have extinguished you can have extinguished he 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 he 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 he cannot extinguish we cannot extinguish you cannot extinguish they cannot extinguish
V-ing form
I cannot be extinguishing you cannot be extinguishing he cannot be extinguishing we cannot be extinguishing you cannot be extinguishing they cannot be extinguishing
Perfect
I cannot have extinguished you cannot have extinguished he 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 he 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 he extinguish? can we extinguish? can you extinguish? can they extinguish?
V-ing form
can I be extinguishing? can you be extinguishing? can he be extinguishing? can we be extinguishing? can you be extinguishing? can they be extinguishing?
Perfect
can I have extinguished? can you have extinguished? can he 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 he 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 he 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 he 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 he 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 he not have been extinguishing? can we not have been extinguishing? can you not have been extinguishing? can they not have been extinguishing?