must stir
Regular verb: stir - stirred- stirred

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must stir
you must stir
she must stir
we must stir
you must stir
they must stir 	I must be stirring
you must be stirring
she must be stirring
we must be stirring
you must be stirring
they must be stirring	I must have stirred
you must have stirred
she must have stirred
we must have stirred
you must have stirred
they must have stirred	I must have been stirring
you must have been stirring
she must have been stirring
we must have been stirring
you must have been stirring
they must have been stirring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not stir
you must not stir
she must not stir
we must not stir
you must not stir
they must not stir 	I must not be stirring
you must not be stirring
she must not be stirring
we must not be stirring
you must not be stirring
they must not be stirring	I must not have stirred
you must not have stirred
she must not have stirred
we must not have stirred
you must not have stirred
they must not have stirred	I must not have been stirring
you must not have been stirring
she must not have been stirring
we must not have been stirring
you must not have been stirring
they must not have been stirring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I stir?
must you stir?
must she stir?
must we stir?
must you stir?
must they stir? 	must I be stirring?
must you be stirring?
must she be stirring?
must we be stirring?
must you be stirring?
must they be stirring? 	must I have stirred?
must you have stirred?
must she have stirred?
must we have stirred?
must you have stirred?
must they have stirred? 	must I have been stirring?
must you have been stirring?
must she have been stirring?
must we have been stirring?
must you have been stirring?
must they have been stirring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not stir?
must you not stir?
must she not stir?
must we not stir?
must you not stir?
must they not stir? 	must I not be stirring?
must you not be stirring?
must she not be stirring?
must we not be stirring?
must you not be stirring?
must they not be stirring? 	must I not have stirred?
must you not have stirred?
must she not have stirred?
must we not have stirred?
must you not have stirred?
must they not have stirred? 	must I not have been stirring?
must you not have been stirring?
must she not have been stirring?
must we not have been stirring?
must you not have been stirring?
must they not have been stirring?