If you are in Adventure Mode with a sword, then you can attempt to break signs. The signs won't break though, but they act like they are being broken.
Linked issues
duplicates 1
Attachments
Comments 1
MC-96667
Signs can be broken with swords in Adventure mode
Resolved
Duplicate
0
goalreadymc
(Unassigned)
Unconfirmed
Minecraft 16w05b
Retrieved
Probably duplicates either MC-8472 or MC-19676