must sough
Regular verb: sough - soughed- soughed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must sough
you must sough
she must sough
we must sough
you must sough
they must sough 	I must be soughing
you must be soughing
she must be soughing
we must be soughing
you must be soughing
they must be soughing	I must have soughed
you must have soughed
she must have soughed
we must have soughed
you must have soughed
they must have soughed	I must have been soughing
you must have been soughing
she must have been soughing
we must have been soughing
you must have been soughing
they must have been soughing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not sough
you must not sough
she must not sough
we must not sough
you must not sough
they must not sough 	I must not be soughing
you must not be soughing
she must not be soughing
we must not be soughing
you must not be soughing
they must not be soughing	I must not have soughed
you must not have soughed
she must not have soughed
we must not have soughed
you must not have soughed
they must not have soughed	I must not have been soughing
you must not have been soughing
she must not have been soughing
we must not have been soughing
you must not have been soughing
they must not have been soughing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I sough?
must you sough?
must she sough?
must we sough?
must you sough?
must they sough? 	must I be soughing?
must you be soughing?
must she be soughing?
must we be soughing?
must you be soughing?
must they be soughing? 	must I have soughed?
must you have soughed?
must she have soughed?
must we have soughed?
must you have soughed?
must they have soughed? 	must I have been soughing?
must you have been soughing?
must she have been soughing?
must we have been soughing?
must you have been soughing?
must they have been soughing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not sough?
must you not sough?
must she not sough?
must we not sough?
must you not sough?
must they not sough? 	must I not be soughing?
must you not be soughing?
must she not be soughing?
must we not be soughing?
must you not be soughing?
must they not be soughing? 	must I not have soughed?
must you not have soughed?
must she not have soughed?
must we not have soughed?
must you not have soughed?
must they not have soughed? 	must I not have been soughing?
must you not have been soughing?
must she not have been soughing?
must we not have been soughing?
must you not have been soughing?
must they not have been soughing?