must titter
Verbe régulier : titter - tittered- tittered
Traduction française : rire bêtement ou sottement - glousser 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must titter
you must titter
she must titter
we must titter
you must titter
they must titter 	I must be tittering
you must be tittering
she must be tittering
we must be tittering
you must be tittering
they must be tittering	I must have tittered
you must have tittered
she must have tittered
we must have tittered
you must have tittered
they must have tittered	I must have been tittering
you must have been tittering
she must have been tittering
we must have been tittering
you must have been tittering
they must have been tittering	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must not titter
you must not titter
she must not titter
we must not titter
you must not titter
they must not titter 	I must not be tittering
you must not be tittering
she must not be tittering
we must not be tittering
you must not be tittering
they must not be tittering	I must not have tittered
you must not have tittered
she must not have tittered
we must not have tittered
you must not have tittered
they must not have tittered	I must not have been tittering
you must not have been tittering
she must not have been tittering
we must not have been tittering
you must not have been tittering
they must not have been tittering	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I titter?
must you titter?
must she titter?
must we titter?
must you titter?
must they titter? 	must I be tittering?
must you be tittering?
must she be tittering?
must we be tittering?
must you be tittering?
must they be tittering? 	must I have tittered?
must you have tittered?
must she have tittered?
must we have tittered?
must you have tittered?
must they have tittered? 	must I have been tittering?
must you have been tittering?
must she have been tittering?
must we have been tittering?
must you have been tittering?
must they have been tittering? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I not titter?
must you not titter?
must she not titter?
must we not titter?
must you not titter?
must they not titter? 	must I not be tittering?
must you not be tittering?
must she not be tittering?
must we not be tittering?
must you not be tittering?
must they not be tittering? 	must I not have tittered?
must you not have tittered?
must she not have tittered?
must we not have tittered?
must you not have tittered?
must they not have tittered? 	must I not have been tittering?
must you not have been tittering?
must she not have been tittering?
must we not have been tittering?
must you not have been tittering?
must they not have been tittering?