can brief
Verbo regular: brief - briefed- briefed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can brief
you can brief
he can brief
we can brief
you can brief
they can brief 	I can be briefing
you can be briefing
he can be briefing
we can be briefing
you can be briefing
they can be briefing	I can have briefed
you can have briefed
he can have briefed
we can have briefed
you can have briefed
they can have briefed	I can have been briefing
you can have been briefing
he can have been briefing
we can have been briefing
you can have been briefing
they can have been briefing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I cannot brief
you cannot brief
he cannot brief
we cannot brief
you cannot brief
they cannot brief 	I cannot be briefing
you cannot be briefing
he cannot be briefing
we cannot be briefing
you cannot be briefing
they cannot be briefing	I cannot have briefed
you cannot have briefed
he cannot have briefed
we cannot have briefed
you cannot have briefed
they cannot have briefed	I cannot have been briefing
you cannot have been briefing
he cannot have been briefing
we cannot have been briefing
you cannot have been briefing
they cannot have been briefing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I brief?
can you brief?
can he brief?
can we brief?
can you brief?
can they brief? 	can I be briefing?
can you be briefing?
can he be briefing?
can we be briefing?
can you be briefing?
can they be briefing? 	can I have briefed?
can you have briefed?
can he have briefed?
can we have briefed?
can you have briefed?
can they have briefed? 	can I have been briefing?
can you have been briefing?
can he have been briefing?
can we have been briefing?
can you have been briefing?
can they have been briefing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I not brief?
can you not brief?
can he not brief?
can we not brief?
can you not brief?
can they not brief? 	can I not be briefing?
can you not be briefing?
can he not be briefing?
can we not be briefing?
can you not be briefing?
can they not be briefing? 	can I not have briefed?
can you not have briefed?
can he not have briefed?
can we not have briefed?
can you not have briefed?
can they not have briefed? 	can I not have been briefing?
can you not have been briefing?
can he not have been briefing?
can we not have been briefing?
can you not have been briefing?
can they not have been briefing?