could flank
Regular verb: flank - flanked- flanked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could flank
you could flank
she could flank
we could flank
you could flank
they could flank 	I could be flanking
you could be flanking
she could be flanking
we could be flanking
you could be flanking
they could be flanking	I could have flanked
you could have flanked
she could have flanked
we could have flanked
you could have flanked
they could have flanked	I could have been flanking
you could have been flanking
she could have been flanking
we could have been flanking
you could have been flanking
they could have been flanking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not flank
you could not flank
she could not flank
we could not flank
you could not flank
they could not flank 	I could not be flanking
you could not be flanking
she could not be flanking
we could not be flanking
you could not be flanking
they could not be flanking	I could not have flanked
you could not have flanked
she could not have flanked
we could not have flanked
you could not have flanked
they could not have flanked	I could not have been flanking
you could not have been flanking
she could not have been flanking
we could not have been flanking
you could not have been flanking
they could not have been flanking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I flank?
could you flank?
could she flank?
could we flank?
could you flank?
could they flank? 	could I be flanking?
could you be flanking?
could she be flanking?
could we be flanking?
could you be flanking?
could they be flanking? 	could I have flanked?
could you have flanked?
could she have flanked?
could we have flanked?
could you have flanked?
could they have flanked? 	could I have been flanking?
could you have been flanking?
could she have been flanking?
could we have been flanking?
could you have been flanking?
could they have been flanking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not flank?
could you not flank?
could she not flank?
could we not flank?
could you not flank?
could they not flank? 	could I not be flanking?
could you not be flanking?
could she not be flanking?
could we not be flanking?
could you not be flanking?
could they not be flanking? 	could I not have flanked?
could you not have flanked?
could she not have flanked?
could we not have flanked?
could you not have flanked?
could they not have flanked? 	could I not have been flanking?
could you not have been flanking?
could she not have been flanking?
could we not have been flanking?
could you not have been flanking?
could they not have been flanking?