must pay
Irregular verb: pay - paid- paid

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must pay
you must pay
he must pay
we must pay
you must pay
they must pay 	I must be paying
you must be paying
he must be paying
we must be paying
you must be paying
they must be paying	I must have paid
you must have paid
he must have paid
we must have paid
you must have paid
they must have paid	I must have been paying
you must have been paying
he must have been paying
we must have been paying
you must have been paying
they must have been paying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not pay
you must not pay
he must not pay
we must not pay
you must not pay
they must not pay 	I must not be paying
you must not be paying
he must not be paying
we must not be paying
you must not be paying
they must not be paying	I must not have paid
you must not have paid
he must not have paid
we must not have paid
you must not have paid
they must not have paid	I must not have been paying
you must not have been paying
he must not have been paying
we must not have been paying
you must not have been paying
they must not have been paying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I pay?
must you pay?
must he pay?
must we pay?
must you pay?
must they pay? 	must I be paying?
must you be paying?
must he be paying?
must we be paying?
must you be paying?
must they be paying? 	must I have paid?
must you have paid?
must he have paid?
must we have paid?
must you have paid?
must they have paid? 	must I have been paying?
must you have been paying?
must he have been paying?
must we have been paying?
must you have been paying?
must they have been paying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not pay?
must you not pay?
must he not pay?
must we not pay?
must you not pay?
must they not pay? 	must I not be paying?
must you not be paying?
must he not be paying?
must we not be paying?
must you not be paying?
must they not be paying? 	must I not have paid?
must you not have paid?
must he not have paid?
must we not have paid?
must you not have paid?
must they not have paid? 	must I not have been paying?
must you not have been paying?
must he not have been paying?
must we not have been paying?
must you not have been paying?
must they not have been paying?