I can headquarter you can headquarter he can headquarter we can headquarter you can headquarter they can headquarter
V-ing form
I can be headquartering you can be headquartering he can be headquartering we can be headquartering you can be headquartering they can be headquartering
Perfect
I can have headquartered you can have headquartered he can have headquartered we can have headquartered you can have headquartered they can have headquartered
V-ing perfect
I can have been headquartering you can have been headquartering he can have been headquartering we can have been headquartering you can have been headquartering they can have been headquartering
Negation
Simple form
I cannot headquarter you cannot headquarter he cannot headquarter we cannot headquarter you cannot headquarter they cannot headquarter
V-ing form
I cannot be headquartering you cannot be headquartering he cannot be headquartering we cannot be headquartering you cannot be headquartering they cannot be headquartering
Perfect
I cannot have headquartered you cannot have headquartered he cannot have headquartered we cannot have headquartered you cannot have headquartered they cannot have headquartered
V-ing perfect
I cannot have been headquartering you cannot have been headquartering he cannot have been headquartering we cannot have been headquartering you cannot have been headquartering they cannot have been headquartering
Interrogative form
Simple form
can I headquarter? can you headquarter? can he headquarter? can we headquarter? can you headquarter? can they headquarter?
V-ing form
can I be headquartering? can you be headquartering? can he be headquartering? can we be headquartering? can you be headquartering? can they be headquartering?
Perfect
can I have headquartered? can you have headquartered? can he have headquartered? can we have headquartered? can you have headquartered? can they have headquartered?
V-ing perfect
can I have been headquartering? can you have been headquartering? can he have been headquartering? can we have been headquartering? can you have been headquartering? can they have been headquartering?
Interro-negative form
Simple form
can I not headquarter? can you not headquarter? can he not headquarter? can we not headquarter? can you not headquarter? can they not headquarter?
V-ing form
can I not be headquartering? can you not be headquartering? can he not be headquartering? can we not be headquartering? can you not be headquartering? can they not be headquartering?
Perfect
can I not have headquartered? can you not have headquartered? can he not have headquartered? can we not have headquartered? can you not have headquartered? can they not have headquartered?
V-ing perfect
can I not have been headquartering? can you not have been headquartering? can he not have been headquartering? can we not have been headquartering? can you not have been headquartering? can they not have been headquartering?