I can flank you can flank he can flank we can flank you can flank they can flank
V-ing form
I can be flanking you can be flanking he can be flanking we can be flanking you can be flanking they can be flanking
Perfect
I can have flanked you can have flanked he can have flanked we can have flanked you can have flanked they can have flanked
V-ing perfect
I can have been flanking you can have been flanking he can have been flanking we can have been flanking you can have been flanking they can have been flanking
Negation
Simple form
I cannot flank you cannot flank he cannot flank we cannot flank you cannot flank they cannot flank
V-ing form
I cannot be flanking you cannot be flanking he cannot be flanking we cannot be flanking you cannot be flanking they cannot be flanking
Perfect
I cannot have flanked you cannot have flanked he cannot have flanked we cannot have flanked you cannot have flanked they cannot have flanked
V-ing perfect
I cannot have been flanking you cannot have been flanking he cannot have been flanking we cannot have been flanking you cannot have been flanking they cannot have been flanking
Interrogative form
Simple form
can I flank? can you flank? can he flank? can we flank? can you flank? can they flank?
V-ing form
can I be flanking? can you be flanking? can he be flanking? can we be flanking? can you be flanking? can they be flanking?
Perfect
can I have flanked? can you have flanked? can he have flanked? can we have flanked? can you have flanked? can they have flanked?
V-ing perfect
can I have been flanking? can you have been flanking? can he have been flanking? can we have been flanking? can you have been flanking? can they have been flanking?
Interro-negative form
Simple form
can I not flank? can you not flank? can he not flank? can we not flank? can you not flank? can they not flank?
V-ing form
can I not be flanking? can you not be flanking? can he not be flanking? can we not be flanking? can you not be flanking? can they not be flanking?
Perfect
can I not have flanked? can you not have flanked? can he not have flanked? can we not have flanked? can you not have flanked? can they not have flanked?
V-ing perfect
can I not have been flanking? can you not have been flanking? can he not have been flanking? can we not have been flanking? can you not have been flanking? can they not have been flanking?