He left the engine running 這句中running是O C補語位置,在補充說明 engine情形,請問running是動名詞或現在分詞,可否再分析一下.謝謝?

He left the engine running(現在分詞：以形容詞作受詞補語). 華語譯：他使發動機運轉著。
#分詞可以當主詞補語和受詞補語；動名詞可以當主詞補語(，無法置於受詞後，以名詞當受詞補語)。
X：He left the engine "which was running". 華語譯：他(離開了？使？)正在運轉的發動機。

動名詞與現在分詞區別在分詞可以修飾名詞，而動名詞除了當複合名詞外並無此特性，僅能當名詞使用。按此原則，本題running當然是現在分詞，將句子展開即He left the engine which was running.

gerund is form of a verb when used as a noun.The -ing form of an English verb when used as a noun as in "in a state of running".------correct if gerund.
participle  in (grammar) verbal adjective qualifying noun "engine" but retaining some properties of a verb"running" and "run" are the present and past participles of "run".The adjective of a participle is a participial (spellimg :-p-a-r-t-I-c-i-p-i-a-l-)adjective, eg:-"running" in " a running engine"eg:-He left the running engine unattended,giving,causing, risking a violent bursting explosion !