must laugh
Verbo regular: laugh - laughed- laughed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must laugh
you must laugh
he must laugh
we must laugh
you must laugh
they must laugh 	I must be laughing
you must be laughing
he must be laughing
we must be laughing
you must be laughing
they must be laughing	I must have laughed
you must have laughed
he must have laughed
we must have laughed
you must have laughed
they must have laughed	I must have been laughing
you must have been laughing
he must have been laughing
we must have been laughing
you must have been laughing
they must have been laughing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not laugh
you must not laugh
he must not laugh
we must not laugh
you must not laugh
they must not laugh 	I must not be laughing
you must not be laughing
he must not be laughing
we must not be laughing
you must not be laughing
they must not be laughing	I must not have laughed
you must not have laughed
he must not have laughed
we must not have laughed
you must not have laughed
they must not have laughed	I must not have been laughing
you must not have been laughing
he must not have been laughing
we must not have been laughing
you must not have been laughing
they must not have been laughing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I laugh?
must you laugh?
must he laugh?
must we laugh?
must you laugh?
must they laugh? 	must I be laughing?
must you be laughing?
must he be laughing?
must we be laughing?
must you be laughing?
must they be laughing? 	must I have laughed?
must you have laughed?
must he have laughed?
must we have laughed?
must you have laughed?
must they have laughed? 	must I have been laughing?
must you have been laughing?
must he have been laughing?
must we have been laughing?
must you have been laughing?
must they have been laughing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not laugh?
must you not laugh?
must he not laugh?
must we not laugh?
must you not laugh?
must they not laugh? 	must I not be laughing?
must you not be laughing?
must he not be laughing?
must we not be laughing?
must you not be laughing?
must they not be laughing? 	must I not have laughed?
must you not have laughed?
must he not have laughed?
must we not have laughed?
must you not have laughed?
must they not have laughed? 	must I not have been laughing?
must you not have been laughing?
must he not have been laughing?
must we not have been laughing?
must you not have been laughing?
must they not have been laughing?