English verb conjugation
COULD ENGRAIL

Regular verb: engrail - engrailed - engrailed

Affirmation

Simple form	V-ing form
I could engrail you could engrail he could engrail we could engrail you could engrail they could engrail	I could be engrailing you could be engrailing he could be engrailing we could be engrailing you could be engrailing they could be engrailing
Perfect	V-ing perfect
I could have engrailed you could have engrailed he could have engrailed we could have engrailed you could have engrailed they could have engrailed	I could have been engrailing you could have been engrailing he could have been engrailing we could have been engrailing you could have been engrailing they could have been engrailing

Negation

Simple form	V-ing form
I couldn't engrail you couldn't engrail he couldn't engrail we couldn't engrail you couldn't engrail they couldn't engrail	I couldn't be engrailing you couldn't be engrailing he couldn't be engrailing we couldn't be engrailing you couldn't be engrailing they couldn't be engrailing
Perfect	V-ing perfect
I couldn't have engrailed you couldn't have engrailed he couldn't have engrailed we couldn't have engrailed you couldn't have engrailed they couldn't have engrailed	I couldn't have been engrailing you couldn't have been engrailing he couldn't have been engrailing we couldn't have been engrailing you couldn't have been engrailing they couldn't have been engrailing

Interrogative form

Simple form	V-ing form
could I engrail? could you engrail? could he engrail? could we engrail? could you engrail? could they engrail?	could I be engrailing? could you be engrailing? could he be engrailing? could we be engrailing? could you be engrailing? could they be engrailing?
Perfect	V-ing perfect
could I have engrailed? could you have engrailed? could he have engrailed? could we have engrailed? could you have engrailed? could they have engrailed?	could I have been engrailing? could you have been engrailing? could he have been engrailing? could we have been engrailing? could you have been engrailing? could they have been engrailing?

Interro-negative form

Simple form	V-ing form
couldn't I engrail? couldn't you engrail? couldn't he engrail? couldn't we engrail? couldn't you engrail? couldn't they engrail?	couldn't I be engrailing? couldn't you be engrailing? couldn't he be engrailing? couldn't we be engrailing? couldn't you be engrailing? couldn't they be engrailing?
Perfect	V-ing perfect
couldn't I have engrailed? couldn't you have engrailed? couldn't he have engrailed? couldn't we have engrailed? couldn't you have engrailed? couldn't they have engrailed?	couldn't I have been engrailing? couldn't you have been engrailing? couldn't he have been engrailing? couldn't we have been engrailing? couldn't you have been engrailing? couldn't they have been engrailing?