1. leave sb alone：不理会某人，不管某人，不打搅
e.g. The principal is busy at his desk. You'd better leave him alone.
校长正忙于桌上的工作，你最好别打扰他。
e.g. Leave him alone and he' ll soon come round.
不要理他，他的气很快就会消的。

2. be aware of

（1）意识到，感觉到
e.g. As I waited, I became aware of something happening in the house.
我在等待的时候, 感觉到房子里发生了什么事。
e.g. He doesn' t seem to be aware of the coldness of their attitude towards his appeal.
他好象没有意识到大家对他呼吁态度冷淡。
（2）知道，懂得，明白
e.g. He cannot be aware of the soliloquies of others.
他不可能知道别人的独白。
e.g. You should therefore be aware of some of the traffic laws.
因此，你该知道一些交通规则。