must cave
Verbo regular: cave - caved- caved

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must cave
you must cave
he must cave
we must cave
you must cave
they must cave 	I must be caving
you must be caving
he must be caving
we must be caving
you must be caving
they must be caving	I must have caved
you must have caved
he must have caved
we must have caved
you must have caved
they must have caved	I must have been caving
you must have been caving
he must have been caving
we must have been caving
you must have been caving
they must have been caving	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not cave
you must not cave
he must not cave
we must not cave
you must not cave
they must not cave 	I must not be caving
you must not be caving
he must not be caving
we must not be caving
you must not be caving
they must not be caving	I must not have caved
you must not have caved
he must not have caved
we must not have caved
you must not have caved
they must not have caved	I must not have been caving
you must not have been caving
he must not have been caving
we must not have been caving
you must not have been caving
they must not have been caving	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I cave?
must you cave?
must he cave?
must we cave?
must you cave?
must they cave? 	must I be caving?
must you be caving?
must he be caving?
must we be caving?
must you be caving?
must they be caving? 	must I have caved?
must you have caved?
must he have caved?
must we have caved?
must you have caved?
must they have caved? 	must I have been caving?
must you have been caving?
must he have been caving?
must we have been caving?
must you have been caving?
must they have been caving? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not cave?
must you not cave?
must he not cave?
must we not cave?
must you not cave?
must they not cave? 	must I not be caving?
must you not be caving?
must he not be caving?
must we not be caving?
must you not be caving?
must they not be caving? 	must I not have caved?
must you not have caved?
must he not have caved?
must we not have caved?
must you not have caved?
must they not have caved? 	must I not have been caving?
must you not have been caving?
must he not have been caving?
must we not have been caving?
must you not have been caving?
must they not have been caving?