انْتَهَى الدَّرْسُ. هَلْ وَصَلَتِ الرِّسَالَةُ؟
The lesson has ended. Has the message arrived?
The first clause is a declaration and the next a question. Without a special reason to bind them, they can stand as separate utterances; mere adjacency does not require wāw.
In an actual passage, their relationship also depends on whether the speaker continues the same topic or shifts to a new one.