A start signal is not an exact time
1The media club is preparing to film a short interview tomorrow. Before anyone enters the studio, a technician must check the lights. The check has not started yet. The club has agreed on a clear sequence: the check comes first, and filming follows. Mina tells the members, "We will start filming when the check ends." She is giving them a start signal, not announcing an exact clock time.
2The technician has not said how long the work will take. Jun therefore writes, "We do not know when the check will end." His sentence does not cancel Mina's plan. The members know what must happen before they begin, even though they cannot yet put a time on the notice. A draft notice says that filming will begin at ten, but Jun removes that detail because nobody has confirmed it.
3One member thinks that every will after when must be removed. Mina asks her to compare the two messages. Her own message connects the beginning of filming with a future event. Jun's message reports a question whose answer is still unknown. Another member writes, "We do not know when will the check end." Jun keeps the future meaning but moves the subject before will. The revised notice includes the plan and the uncertainty without confusing them. It also asks members to wait for a message from the technician. Nobody is told to enter the studio before the check is complete.