 We are still pursuing but it has been perforce slow as the horses are done and the enemy , when advancing , entrenched himself at various points … which has enabled him to fight a most masterly rearguard action … As I am moving on , I must close 
 We are still pursuing but it <a href='uninflect' title='1'><mark>has</mark></a> been perforce slow as the horses are done and the enemy , when advancing , entrenched himself at various points … which <a href='been_done' title='2'><mark>has</mark></a> enabled him to fight a most masterly rearguard action … As I am moving on , I must close 
We are still pursuing but it have been perforce slow as the horses are done and the enemy , when advancing , entrenched himself at various points … which done enabled him to fight a most masterly rearguard action … As I am moving on , I must close