[正] On arriving at Singapore, I found my friend waiting for me at the airport.
注:凡是帶有介詞的動名詞,或是單獨的分詞,必須有一個意義上的主語,來配合這個動作。到達新加坡的是“我”,而主句中的主語卻是“我的朋友”,動作不能配合,所以是錯誤的。介詞 before 與 after 的情形和 on 一樣,故下面的兩句也是錯的:After finishing his work, I paid him. Before reading the text, the vocabulary should be learned.
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