Regular verb: brief - briefed - briefed
Simple form | V-ing form |
I must brief you must brief he must brief we must brief you must brief they must brief | I must be briefing you must be briefing he must be briefing we must be briefing you must be briefing they must be briefing |
Perfect | V-ing perfect |
I must have briefed you must have briefed he must have briefed we must have briefed you must have briefed they must have briefed | I must have been briefing you must have been briefing he must have been briefing we must have been briefing you must have been briefing they must have been briefing |
Simple form | V-ing form |
I mustn't brief you mustn't brief he mustn't brief we mustn't brief you mustn't brief they mustn't brief | I mustn't be briefing you mustn't be briefing he mustn't be briefing we mustn't be briefing you mustn't be briefing they mustn't be briefing |
Perfect | V-ing perfect |
I mustn't have briefed you mustn't have briefed he mustn't have briefed we mustn't have briefed you mustn't have briefed they mustn't have briefed | I mustn't have been briefing you mustn't have been briefing he mustn't have been briefing we mustn't have been briefing you mustn't have been briefing they mustn't have been briefing |
Simple form | V-ing form |
must I brief? must you brief? must he brief? must we brief? must you brief? must they brief? | must I be briefing? must you be briefing? must he be briefing? must we be briefing? must you be briefing? must they be briefing? |
Perfect | V-ing perfect |
must I have briefed? must you have briefed? must he have briefed? must we have briefed? must you have briefed? must they have briefed? | must I have been briefing? must you have been briefing? must he have been briefing? must we have been briefing? must you have been briefing? must they have been briefing? |
Simple form | V-ing form |
mustn't I brief? mustn't you brief? mustn't he brief? mustn't we brief? mustn't you brief? mustn't they brief? | mustn't I be briefing? mustn't you be briefing? mustn't he be briefing? mustn't we be briefing? mustn't you be briefing? mustn't they be briefing? |
Perfect | V-ing perfect |
mustn't I have briefed? mustn't you have briefed? mustn't he have briefed? mustn't we have briefed? mustn't you have briefed? mustn't they have briefed? | mustn't I have been briefing? mustn't you have been briefing? mustn't he have been briefing? mustn't we have been briefing? mustn't you have been briefing? mustn't they have been briefing? |