must spay
Regular verb: spay - spayed- spayed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must spay
you must spay
she must spay
we must spay
you must spay
they must spay 	I must be spaying
you must be spaying
she must be spaying
we must be spaying
you must be spaying
they must be spaying	I must have spayed
you must have spayed
she must have spayed
we must have spayed
you must have spayed
they must have spayed	I must have been spaying
you must have been spaying
she must have been spaying
we must have been spaying
you must have been spaying
they must have been spaying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not spay
you must not spay
she must not spay
we must not spay
you must not spay
they must not spay 	I must not be spaying
you must not be spaying
she must not be spaying
we must not be spaying
you must not be spaying
they must not be spaying	I must not have spayed
you must not have spayed
she must not have spayed
we must not have spayed
you must not have spayed
they must not have spayed	I must not have been spaying
you must not have been spaying
she must not have been spaying
we must not have been spaying
you must not have been spaying
they must not have been spaying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I spay?
must you spay?
must she spay?
must we spay?
must you spay?
must they spay? 	must I be spaying?
must you be spaying?
must she be spaying?
must we be spaying?
must you be spaying?
must they be spaying? 	must I have spayed?
must you have spayed?
must she have spayed?
must we have spayed?
must you have spayed?
must they have spayed? 	must I have been spaying?
must you have been spaying?
must she have been spaying?
must we have been spaying?
must you have been spaying?
must they have been spaying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not spay?
must you not spay?
must she not spay?
must we not spay?
must you not spay?
must they not spay? 	must I not be spaying?
must you not be spaying?
must she not be spaying?
must we not be spaying?
must you not be spaying?
must they not be spaying? 	must I not have spayed?
must you not have spayed?
must she not have spayed?
must we not have spayed?
must you not have spayed?
must they not have spayed? 	must I not have been spaying?
must you not have been spaying?
must she not have been spaying?
must we not have been spaying?
must you not have been spaying?
must they not have been spaying?