English verb conjugation
CAN BRIEF

Regular verb: brief - briefed - briefed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

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