English verb conjugation
CAN EXTINGUISH

Regular verb: extinguish - extinguished - extinguished

Affirmation

Simple form	V-ing form
I can extinguish you can extinguish he can extinguish we can extinguish you can extinguish they can extinguish	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	V-ing 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	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	V-ing form
I can't extinguish you can't extinguish he can't extinguish we can't extinguish you can't extinguish they can't extinguish	I can't be extinguishing you can't be extinguishing he can't be extinguishing we can't be extinguishing you can't be extinguishing they can't be extinguishing
Perfect	V-ing perfect
I can't have extinguished you can't have extinguished he can't have extinguished we can't have extinguished you can't have extinguished they can't have extinguished	I can't have been extinguishing you can't have been extinguishing he can't have been extinguishing we can't have been extinguishing you can't have been extinguishing they can't have been extinguishing

Interrogative form

Simple form	V-ing form
can I extinguish? can you extinguish? can he extinguish? can we extinguish? can you extinguish? can they extinguish?	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	V-ing 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?	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	V-ing form
can't I extinguish? can't you extinguish? can't he extinguish? can't we extinguish? can't you extinguish? can't they extinguish?	can't I be extinguishing? can't you be extinguishing? can't he be extinguishing? can't we be extinguishing? can't you be extinguishing? can't they be extinguishing?
Perfect	V-ing perfect
can't I have extinguished? can't you have extinguished? can't he have extinguished? can't we have extinguished? can't you have extinguished? can't they have extinguished?	can't I have been extinguishing? can't you have been extinguishing? can't he have been extinguishing? can't we have been extinguishing? can't you have been extinguishing? can't they have been extinguishing?