English verb conjugation
CAN PECK

Regular verb: peck - pecked - pecked

Affirmation

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

Interrogative form

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