That he is dead and no longer with them
Answer:
the servants of both houses
Explanation:
What really causes the fight is the fact that the Montagues and Capulets hate each other. They hate each other so much that even their servants hate one another. It is these servants who are the immediate cause of the fight. Sampson and Gregory (Capulet servants) are walking along when some Montague servant come out.
The subjunctive mood is the best.
The subjunctive is rarely used in colloquial English. Totally irrelevant information, but... it is a relic from Latin, where there are many uses for a subjunctive. There is even a special conditional using the subjunctive mood that expresses the exact circumstances you described, which is usually called future less vivid.
