English verb conjugation
COULD OUTPUT

Irregular verb: output - output - output

Affirmation

Simple form	V-ing form
I could output you could output he could output we could output you could output they could output	I could be outputing you could be outputing he could be outputing we could be outputing you could be outputing they could be outputing
Perfect	V-ing perfect
I could have output you could have output he could have output we could have output you could have output they could have output	I could have been outputing you could have been outputing he could have been outputing we could have been outputing you could have been outputing they could have been outputing

Negation

Simple form	V-ing form
I couldn't output you couldn't output he couldn't output we couldn't output you couldn't output they couldn't output	I couldn't be outputing you couldn't be outputing he couldn't be outputing we couldn't be outputing you couldn't be outputing they couldn't be outputing
Perfect	V-ing perfect
I couldn't have output you couldn't have output he couldn't have output we couldn't have output you couldn't have output they couldn't have output	I couldn't have been outputing you couldn't have been outputing he couldn't have been outputing we couldn't have been outputing you couldn't have been outputing they couldn't have been outputing

Interrogative form

Simple form	V-ing form
could I output? could you output? could he output? could we output? could you output? could they output?	could I be outputing? could you be outputing? could he be outputing? could we be outputing? could you be outputing? could they be outputing?
Perfect	V-ing perfect
could I have output? could you have output? could he have output? could we have output? could you have output? could they have output?	could I have been outputing? could you have been outputing? could he have been outputing? could we have been outputing? could you have been outputing? could they have been outputing?

Interro-negative form

Simple form	V-ing form
couldn't I output? couldn't you output? couldn't he output? couldn't we output? couldn't you output? couldn't they output?	couldn't I be outputing? couldn't you be outputing? couldn't he be outputing? couldn't we be outputing? couldn't you be outputing? couldn't they be outputing?
Perfect	V-ing perfect
couldn't I have output? couldn't you have output? couldn't he have output? couldn't we have output? couldn't you have output? couldn't they have output?	couldn't I have been outputing? couldn't you have been outputing? couldn't he have been outputing? couldn't we have been outputing? couldn't you have been outputing? couldn't they have been outputing?