English verb conjugation
COULD PECK

Regular verb: peck - pecked - pecked

Affirmation

Simple form	V-ing form
I could peck you could peck she could peck we could peck you could peck they could peck	I could be pecking you could be pecking she could be pecking we could be pecking you could be pecking they could be pecking
Perfect	V-ing perfect
I could have pecked you could have pecked she could have pecked we could have pecked you could have pecked they could have pecked	I could have been pecking you could have been pecking she could have been pecking we could have been pecking you could have been pecking they could have been pecking

Negation

Simple form	V-ing form
I couldn't peck you couldn't peck she couldn't peck we couldn't peck you couldn't peck they couldn't peck	I couldn't be pecking you couldn't be pecking she couldn't be pecking we couldn't be pecking you couldn't be pecking they couldn't be pecking
Perfect	V-ing perfect
I couldn't have pecked you couldn't have pecked she couldn't have pecked we couldn't have pecked you couldn't have pecked they couldn't have pecked	I couldn't have been pecking you couldn't have been pecking she couldn't have been pecking we couldn't have been pecking you couldn't have been pecking they couldn't have been pecking

Interrogative form

Simple form	V-ing form
could I peck? could you peck? could she peck? could we peck? could you peck? could they peck?	could I be pecking? could you be pecking? could she be pecking? could we be pecking? could you be pecking? could they be pecking?
Perfect	V-ing perfect
could I have pecked? could you have pecked? could she have pecked? could we have pecked? could you have pecked? could they have pecked?	could I have been pecking? could you have been pecking? could she have been pecking? could we have been pecking? could you have been pecking? could they have been pecking?

Interro-negative form

Simple form	V-ing form
couldn't I peck? couldn't you peck? couldn't she peck? couldn't we peck? couldn't you peck? couldn't they peck?	couldn't I be pecking? couldn't you be pecking? couldn't she be pecking? couldn't we be pecking? couldn't you be pecking? couldn't they be pecking?
Perfect	V-ing perfect
couldn't I have pecked? couldn't you have pecked? couldn't she have pecked? couldn't we have pecked? couldn't you have pecked? couldn't they have pecked?	couldn't I have been pecking? couldn't you have been pecking? couldn't she have been pecking? couldn't we have been pecking? couldn't you have been pecking? couldn't they have been pecking?