مَنْ جَاءَ؟ / مَتَى جَاءَ؟ / مِنْ أَيْنَ جَاءَ؟ / كَيْفَ جَاءَ؟
Who came? / When did he come? / Where did he come from? / In what manner did he come?
All these questions concern the event expressed by jāʾa, yet each seeks a different unknown constituent. The first asks for the agent, the second for time, the third for origin, and the fourth for manner.
In rhetoric this difference matters because any one aspect of an event can become the focal information. Choosing the proper interrogative aligns the sentence with the speaker's precise purpose.