must elapse
Verbo regular: elapse - elapsed- elapsed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must elapse
you must elapse
he must elapse
we must elapse
you must elapse
they must elapse 	I must be elapsing
you must be elapsing
he must be elapsing
we must be elapsing
you must be elapsing
they must be elapsing	I must have elapsed
you must have elapsed
he must have elapsed
we must have elapsed
you must have elapsed
they must have elapsed	I must have been elapsing
you must have been elapsing
he must have been elapsing
we must have been elapsing
you must have been elapsing
they must have been elapsing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not elapse
you must not elapse
he must not elapse
we must not elapse
you must not elapse
they must not elapse 	I must not be elapsing
you must not be elapsing
he must not be elapsing
we must not be elapsing
you must not be elapsing
they must not be elapsing	I must not have elapsed
you must not have elapsed
he must not have elapsed
we must not have elapsed
you must not have elapsed
they must not have elapsed	I must not have been elapsing
you must not have been elapsing
he must not have been elapsing
we must not have been elapsing
you must not have been elapsing
they must not have been elapsing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I elapse?
must you elapse?
must he elapse?
must we elapse?
must you elapse?
must they elapse? 	must I be elapsing?
must you be elapsing?
must he be elapsing?
must we be elapsing?
must you be elapsing?
must they be elapsing? 	must I have elapsed?
must you have elapsed?
must he have elapsed?
must we have elapsed?
must you have elapsed?
must they have elapsed? 	must I have been elapsing?
must you have been elapsing?
must he have been elapsing?
must we have been elapsing?
must you have been elapsing?
must they have been elapsing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not elapse?
must you not elapse?
must he not elapse?
must we not elapse?
must you not elapse?
must they not elapse? 	must I not be elapsing?
must you not be elapsing?
must he not be elapsing?
must we not be elapsing?
must you not be elapsing?
must they not be elapsing? 	must I not have elapsed?
must you not have elapsed?
must he not have elapsed?
must we not have elapsed?
must you not have elapsed?
must they not have elapsed? 	must I not have been elapsing?
must you not have been elapsing?
must he not have been elapsing?
must we not have been elapsing?
must you not have been elapsing?
must they not have been elapsing?