English verb conjugation
COULD CELEBRATE

Regular verb: celebrate - celebrated - celebrated

Affirmation

Simple form	V-ing form
I could celebrate you could celebrate he could celebrate we could celebrate you could celebrate they could celebrate	I could be celebrating you could be celebrating he could be celebrating we could be celebrating you could be celebrating they could be celebrating
Perfect	V-ing perfect
I could have celebrated you could have celebrated he could have celebrated we could have celebrated you could have celebrated they could have celebrated	I could have been celebrating you could have been celebrating he could have been celebrating we could have been celebrating you could have been celebrating they could have been celebrating

Negation

Simple form	V-ing form
I couldn't celebrate you couldn't celebrate he couldn't celebrate we couldn't celebrate you couldn't celebrate they couldn't celebrate	I couldn't be celebrating you couldn't be celebrating he couldn't be celebrating we couldn't be celebrating you couldn't be celebrating they couldn't be celebrating
Perfect	V-ing perfect
I couldn't have celebrated you couldn't have celebrated he couldn't have celebrated we couldn't have celebrated you couldn't have celebrated they couldn't have celebrated	I couldn't have been celebrating you couldn't have been celebrating he couldn't have been celebrating we couldn't have been celebrating you couldn't have been celebrating they couldn't have been celebrating

Interrogative form

Simple form	V-ing form
could I celebrate? could you celebrate? could he celebrate? could we celebrate? could you celebrate? could they celebrate?	could I be celebrating? could you be celebrating? could he be celebrating? could we be celebrating? could you be celebrating? could they be celebrating?
Perfect	V-ing perfect
could I have celebrated? could you have celebrated? could he have celebrated? could we have celebrated? could you have celebrated? could they have celebrated?	could I have been celebrating? could you have been celebrating? could he have been celebrating? could we have been celebrating? could you have been celebrating? could they have been celebrating?

Interro-negative form

Simple form	V-ing form
couldn't I celebrate? couldn't you celebrate? couldn't he celebrate? couldn't we celebrate? couldn't you celebrate? couldn't they celebrate?	couldn't I be celebrating? couldn't you be celebrating? couldn't he be celebrating? couldn't we be celebrating? couldn't you be celebrating? couldn't they be celebrating?
Perfect	V-ing perfect
couldn't I have celebrated? couldn't you have celebrated? couldn't he have celebrated? couldn't we have celebrated? couldn't you have celebrated? couldn't they have celebrated?	couldn't I have been celebrating? couldn't you have been celebrating? couldn't he have been celebrating? couldn't we have been celebrating? couldn't you have been celebrating? couldn't they have been celebrating?