must peck
Regular verb: peck - pecked- pecked

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

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

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

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