must spring
Verbo irregolare: spring - sprang, sprung- sprung

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must spring
you must spring
she must spring
we must spring
you must spring
they must spring 	I must be springing
you must be springing
she must be springing
we must be springing
you must be springing
they must be springing	I must have sprung
you must have sprung
she must have sprung
we must have sprung
you must have sprung
they must have sprung	I must have been springing
you must have been springing
she must have been springing
we must have been springing
you must have been springing
they must have been springing	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must not spring
you must not spring
she must not spring
we must not spring
you must not spring
they must not spring 	I must not be springing
you must not be springing
she must not be springing
we must not be springing
you must not be springing
they must not be springing	I must not have sprung
you must not have sprung
she must not have sprung
we must not have sprung
you must not have sprung
they must not have sprung	I must not have been springing
you must not have been springing
she must not have been springing
we must not have been springing
you must not have been springing
they must not have been springing	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I spring?
must you spring?
must she spring?
must we spring?
must you spring?
must they spring? 	must I be springing?
must you be springing?
must she be springing?
must we be springing?
must you be springing?
must they be springing? 	must I have sprung?
must you have sprung?
must she have sprung?
must we have sprung?
must you have sprung?
must they have sprung? 	must I have been springing?
must you have been springing?
must she have been springing?
must we have been springing?
must you have been springing?
must they have been springing? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I not spring?
must you not spring?
must she not spring?
must we not spring?
must you not spring?
must they not spring? 	must I not be springing?
must you not be springing?
must she not be springing?
must we not be springing?
must you not be springing?
must they not be springing? 	must I not have sprung?
must you not have sprung?
must she not have sprung?
must we not have sprung?
must you not have sprung?
must they not have sprung? 	must I not have been springing?
must you not have been springing?
must she not have been springing?
must we not have been springing?
must you not have been springing?
must they not have been springing?