1. I have confronted an attacker in my imagination, not in reality. A man is walking down the street. I lock my car and walk to my apartment with my key ready.
    他很害怕。我害怕我会吓着他，从而致使他朝我开枪，我还担心我把钱给他以后，他仍然会朝我开枪。

2. I imagine another possibility. I am walking with my gun in my hand when I hear the voice. The man mustn't have seen my gun.
    我的朋友便不由自主地锁上了车门。