Final answer:
The common themes in "The Crucible" and "Half-Hanged Mary" are witchcraft and accusation, focusing on the Salem witch trials' hysteria and its impacts.
Step-by-step explanation:
Common themes in "The Crucible" by Arthur Miller and the poem "Half-Hanged Mary" are witchcraft and accusation. Both works are set during the time of the Salem witch trials and explore the hysteria and fear that lead to false accusations and the subsequent social ramifications. They delve into the human capacity for cruelty in the name of righteousness and the destructive consequences of scapegoating and moral panic.