English verb conjugation
CAN PECK

Regular verb: peck - pecked - pecked

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

Simple form	V-ing form
can I not peck? can you not peck? can she not peck? can we not peck? can you not peck? can they not peck?	can I not be pecking? can you not be pecking? can she not be pecking? can we not be pecking? can you not be pecking? can they not be pecking?
Perfect	V-ing perfect
can I not have pecked? can you not have pecked? can she not have pecked? can we not have pecked? can you not have pecked? can they not have pecked?	can I not have been pecking? can you not have been pecking? can she not have been pecking? can we not have been pecking? can you not have been pecking? can they not have been pecking?