must cause
Verbo regular: cause - caused- caused

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must cause
you must cause
he must cause
we must cause
you must cause
they must cause 	I must be causing
you must be causing
he must be causing
we must be causing
you must be causing
they must be causing	I must have caused
you must have caused
he must have caused
we must have caused
you must have caused
they must have caused	I must have been causing
you must have been causing
he must have been causing
we must have been causing
you must have been causing
they must have been causing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not cause
you must not cause
he must not cause
we must not cause
you must not cause
they must not cause 	I must not be causing
you must not be causing
he must not be causing
we must not be causing
you must not be causing
they must not be causing	I must not have caused
you must not have caused
he must not have caused
we must not have caused
you must not have caused
they must not have caused	I must not have been causing
you must not have been causing
he must not have been causing
we must not have been causing
you must not have been causing
they must not have been causing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I cause?
must you cause?
must he cause?
must we cause?
must you cause?
must they cause? 	must I be causing?
must you be causing?
must he be causing?
must we be causing?
must you be causing?
must they be causing? 	must I have caused?
must you have caused?
must he have caused?
must we have caused?
must you have caused?
must they have caused? 	must I have been causing?
must you have been causing?
must he have been causing?
must we have been causing?
must you have been causing?
must they have been causing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not cause?
must you not cause?
must he not cause?
must we not cause?
must you not cause?
must they not cause? 	must I not be causing?
must you not be causing?
must he not be causing?
must we not be causing?
must you not be causing?
must they not be causing? 	must I not have caused?
must you not have caused?
must he not have caused?
must we not have caused?
must you not have caused?
must they not have caused? 	must I not have been causing?
must you not have been causing?
must he not have been causing?
must we not have been causing?
must you not have been causing?
must they not have been causing?