must guess
Regular verb: guess - guessed- guessed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must guess
you must guess
he must guess
we must guess
you must guess
they must guess 	I must be guessing
you must be guessing
he must be guessing
we must be guessing
you must be guessing
they must be guessing	I must have guessed
you must have guessed
he must have guessed
we must have guessed
you must have guessed
they must have guessed	I must have been guessing
you must have been guessing
he must have been guessing
we must have been guessing
you must have been guessing
they must have been guessing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not guess
you must not guess
he must not guess
we must not guess
you must not guess
they must not guess 	I must not be guessing
you must not be guessing
he must not be guessing
we must not be guessing
you must not be guessing
they must not be guessing	I must not have guessed
you must not have guessed
he must not have guessed
we must not have guessed
you must not have guessed
they must not have guessed	I must not have been guessing
you must not have been guessing
he must not have been guessing
we must not have been guessing
you must not have been guessing
they must not have been guessing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I guess?
must you guess?
must he guess?
must we guess?
must you guess?
must they guess? 	must I be guessing?
must you be guessing?
must he be guessing?
must we be guessing?
must you be guessing?
must they be guessing? 	must I have guessed?
must you have guessed?
must he have guessed?
must we have guessed?
must you have guessed?
must they have guessed? 	must I have been guessing?
must you have been guessing?
must he have been guessing?
must we have been guessing?
must you have been guessing?
must they have been guessing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not guess?
must you not guess?
must he not guess?
must we not guess?
must you not guess?
must they not guess? 	must I not be guessing?
must you not be guessing?
must he not be guessing?
must we not be guessing?
must you not be guessing?
must they not be guessing? 	must I not have guessed?
must you not have guessed?
must he not have guessed?
must we not have guessed?
must you not have guessed?
must they not have guessed? 	must I not have been guessing?
must you not have been guessing?
must he not have been guessing?
must we not have been guessing?
must you not have been guessing?
must they not have been guessing?