can peck
Regular verb: peck - pecked- pecked

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