English verb conjugation
MUST SPY

Regular verb: spy - spied - spied

Affirmation

Simple form	V-ing form
I must spy you must spy he must spy we must spy you must spy they must spy	I must be spying you must be spying he must be spying we must be spying you must be spying they must be spying
Perfect	V-ing perfect
I must have spied you must have spied he must have spied we must have spied you must have spied they must have spied	I must have been spying you must have been spying he must have been spying we must have been spying you must have been spying they must have been spying

Negation

Simple form	V-ing form
I must not spy you must not spy he must not spy we must not spy you must not spy they must not spy	I must not be spying you must not be spying he must not be spying we must not be spying you must not be spying they must not be spying
Perfect	V-ing perfect
I must not have spied you must not have spied he must not have spied we must not have spied you must not have spied they must not have spied	I must not have been spying you must not have been spying he must not have been spying we must not have been spying you must not have been spying they must not have been spying

Interrogative form

Simple form	V-ing form
must I spy? must you spy? must he spy? must we spy? must you spy? must they spy?	must I be spying? must you be spying? must he be spying? must we be spying? must you be spying? must they be spying?
Perfect	V-ing perfect
must I have spied? must you have spied? must he have spied? must we have spied? must you have spied? must they have spied?	must I have been spying? must you have been spying? must he have been spying? must we have been spying? must you have been spying? must they have been spying?

Interro-negative form

Simple form	V-ing form
must I not spy? must you not spy? must he not spy? must we not spy? must you not spy? must they not spy?	must I not be spying? must you not be spying? must he not be spying? must we not be spying? must you not be spying? must they not be spying?
Perfect	V-ing perfect
must I not have spied? must you not have spied? must he not have spied? must we not have spied? must you not have spied? must they not have spied?	must I not have been spying? must you not have been spying? must he not have been spying? must we not have been spying? must you not have been spying? must they not have been spying?