In Exam questions you must prove the Actus Reus (AR) and Mens rea (MR) or murder as stated below. The easiest way to do this is to memorise the definition below and then systematically explain what the words mean. If you are doing OCR this should give you full marks for your A01 section (Knowledge and understanding).
"The unlawful killing of a reasonable person in being under the Queen's peace with malice aforethought expressed or implied"
Murder is a common-law offense defined as the unlawful killing of a reasonable person in being with malice aforethought expressed or implied.