1. My neighbor's daughter is a happy-go-lucky girl who is doing well in school and has many friends.2. I thought they liked hanging out with me, but I guess I was fooling myself.3. Do not trust anyone on the street. A con artist may use an innocent-looking child to cheat you out of money.
 happy-go-lucky; carefree fool oneself形容一個人及時行樂, 不在乎明天會發生什麼事情.I thought they liked hanging out with me, but I guess I was fooling myself. 的意思就是 "我以為他們喜歡跟我來往，其實並不然，看來我太天真了"
When a man and a woman start dating, they need to go through an adjstment period before they decide to marry each other.