在It was a bit lonely being an only child?中，it?為形式主語，真正的主語是動名詞短語?being an only child，所以句子的意思就是：成為獨生子女（being an only child）這件事讓人感到寂寞。

換句話說，我認(rèn)為?being an only child?與?an only child?在意義上是有區(qū)別的，前得指一件事，后者才指人。

類例：Being a teacher is not easy.?當(dāng)老師不容易。（而不是“老師不容易”）

類似地還有：

Being a hospital Sister had its uses.?在醫(yī)院當(dāng)護(hù)士有它的好處。

Being a soldier can involve getting killed.?當(dāng)兵就有可能犧牲。

Being a foreigner was not a handicap.?身為外國人并不是一個障礙。

Being a wife and mother doesn’t really fulfill me.??做賢妻良母并不能真正使我滿足。