must second-guess
Regular verb: second-guess - second-guessed- second-guessed

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't second-guess
you mustn't second-guess
he mustn't second-guess
we mustn't second-guess
you mustn't second-guess
they mustn't second-guess 	I mustn't be second-guessing
you mustn't be second-guessing
he mustn't be second-guessing
we mustn't be second-guessing
you mustn't be second-guessing
they mustn't be second-guessing	I mustn't have second-guessed
you mustn't have second-guessed
he mustn't have second-guessed
we mustn't have second-guessed
you mustn't have second-guessed
they mustn't have second-guessed	I mustn't have been second-guessing
you mustn't have been second-guessing
he mustn't have been second-guessing
we mustn't have been second-guessing
you mustn't have been second-guessing
they mustn't have been second-guessing	

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

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I second-guess?
mustn't you second-guess?
mustn't he second-guess?
mustn't we second-guess?
mustn't you second-guess?
mustn't they second-guess? 	mustn't I be second-guessing?
mustn't you be second-guessing?
mustn't he be second-guessing?
mustn't we be second-guessing?
mustn't you be second-guessing?
mustn't they be second-guessing? 	mustn't I have second-guessed?
mustn't you have second-guessed?
mustn't he have second-guessed?
mustn't we have second-guessed?
mustn't you have second-guessed?
mustn't they have second-guessed? 	mustn't I have been second-guessing?
mustn't you have been second-guessing?
mustn't he have been second-guessing?
mustn't we have been second-guessing?
mustn't you have been second-guessing?
mustn't they have been second-guessing?