can brief
Regular verb: brief - briefed- briefed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	

Negation 	
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I can't brief
you can't brief
he can't brief
we can't brief
you can't brief
they can't brief 	I can't be briefing
you can't be briefing
he can't be briefing
we can't be briefing
you can't be briefing
they can't be briefing	I can't have briefed
you can't have briefed
he can't have briefed
we can't have briefed
you can't have briefed
they can't have briefed	I can't have been briefing
you can't have been briefing
he can't have been briefing
we can't have been briefing
you can't have been briefing
they can't have been briefing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I brief?
can't you brief?
can't he brief?
can't we brief?
can't you brief?
can't they brief? 	can't I be briefing?
can't you be briefing?
can't he be briefing?
can't we be briefing?
can't you be briefing?
can't they be briefing? 	can't I have briefed?
can't you have briefed?
can't he have briefed?
can't we have briefed?
can't you have briefed?
can't they have briefed? 	can't I have been briefing?
can't you have been briefing?
can't he have been briefing?
can't we have been briefing?
can't you have been briefing?
can't they have been briefing?