must forestall
Verbo regular: forestall - forestalled- forestalled

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must forestall
you must forestall
he must forestall
we must forestall
you must forestall
they must forestall 	I must be forestalling
you must be forestalling
he must be forestalling
we must be forestalling
you must be forestalling
they must be forestalling	I must have forestalled
you must have forestalled
he must have forestalled
we must have forestalled
you must have forestalled
they must have forestalled	I must have been forestalling
you must have been forestalling
he must have been forestalling
we must have been forestalling
you must have been forestalling
they must have been forestalling	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not forestall
you must not forestall
he must not forestall
we must not forestall
you must not forestall
they must not forestall 	I must not be forestalling
you must not be forestalling
he must not be forestalling
we must not be forestalling
you must not be forestalling
they must not be forestalling	I must not have forestalled
you must not have forestalled
he must not have forestalled
we must not have forestalled
you must not have forestalled
they must not have forestalled	I must not have been forestalling
you must not have been forestalling
he must not have been forestalling
we must not have been forestalling
you must not have been forestalling
they must not have been forestalling	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I forestall?
must you forestall?
must he forestall?
must we forestall?
must you forestall?
must they forestall? 	must I be forestalling?
must you be forestalling?
must he be forestalling?
must we be forestalling?
must you be forestalling?
must they be forestalling? 	must I have forestalled?
must you have forestalled?
must he have forestalled?
must we have forestalled?
must you have forestalled?
must they have forestalled? 	must I have been forestalling?
must you have been forestalling?
must he have been forestalling?
must we have been forestalling?
must you have been forestalling?
must they have been forestalling? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not forestall?
must you not forestall?
must he not forestall?
must we not forestall?
must you not forestall?
must they not forestall? 	must I not be forestalling?
must you not be forestalling?
must he not be forestalling?
must we not be forestalling?
must you not be forestalling?
must they not be forestalling? 	must I not have forestalled?
must you not have forestalled?
must he not have forestalled?
must we not have forestalled?
must you not have forestalled?
must they not have forestalled? 	must I not have been forestalling?
must you not have been forestalling?
must he not have been forestalling?
must we not have been forestalling?
must you not have been forestalling?
must they not have been forestalling?