[误] On arriving at Singapore, my friend was waiting for me at the airport.
[正] On arriving at Singapore, I found my friend waiting for me at the airport.
注：凡是带有介词的动名词，或是单独的分词，必须有一个意义上的主语，来配合这个动作。到达新加坡的是“我”，而主句中的主语却是“我的朋友”，动作不能配合，所以是错误的。介词 before 与 after 的情形和 on 一样，故下面的两句也是错的：After finishing his work, I paid him. Before reading the text, the vocabulary should be learned.
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