English verb conjugation
COULD ELAPSE

Regular verb: elapse - elapsed - elapsed

Affirmation

Simple form	V-ing form
I could elapse you could elapse he could elapse we could elapse you could elapse they could elapse	I could be elapsing you could be elapsing he could be elapsing we could be elapsing you could be elapsing they could be elapsing
Perfect	V-ing perfect
I could have elapsed you could have elapsed he could have elapsed we could have elapsed you could have elapsed they could have elapsed	I could have been elapsing you could have been elapsing he could have been elapsing we could have been elapsing you could have been elapsing they could have been elapsing

Negation

Simple form	V-ing form
I couldn't elapse you couldn't elapse he couldn't elapse we couldn't elapse you couldn't elapse they couldn't elapse	I couldn't be elapsing you couldn't be elapsing he couldn't be elapsing we couldn't be elapsing you couldn't be elapsing they couldn't be elapsing
Perfect	V-ing perfect
I couldn't have elapsed you couldn't have elapsed he couldn't have elapsed we couldn't have elapsed you couldn't have elapsed they couldn't have elapsed	I couldn't have been elapsing you couldn't have been elapsing he couldn't have been elapsing we couldn't have been elapsing you couldn't have been elapsing they couldn't have been elapsing

Interrogative form

Simple form	V-ing form
could I elapse? could you elapse? could he elapse? could we elapse? could you elapse? could they elapse?	could I be elapsing? could you be elapsing? could he be elapsing? could we be elapsing? could you be elapsing? could they be elapsing?
Perfect	V-ing perfect
could I have elapsed? could you have elapsed? could he have elapsed? could we have elapsed? could you have elapsed? could they have elapsed?	could I have been elapsing? could you have been elapsing? could he have been elapsing? could we have been elapsing? could you have been elapsing? could they have been elapsing?

Interro-negative form

Simple form	V-ing form
couldn't I elapse? couldn't you elapse? couldn't he elapse? couldn't we elapse? couldn't you elapse? couldn't they elapse?	couldn't I be elapsing? couldn't you be elapsing? couldn't he be elapsing? couldn't we be elapsing? couldn't you be elapsing? couldn't they be elapsing?
Perfect	V-ing perfect
couldn't I have elapsed? couldn't you have elapsed? couldn't he have elapsed? couldn't we have elapsed? couldn't you have elapsed? couldn't they have elapsed?	couldn't I have been elapsing? couldn't you have been elapsing? couldn't he have been elapsing? couldn't we have been elapsing? couldn't you have been elapsing? couldn't they have been elapsing?