be动词后面可以接名词、形容词......等等作表语，，那么，其他系动词呢?（比如，grow, become,feel,smell,look 等等）。。下面这个问题，请指教：
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The little prince looked everywhere to find a place to sit down; but the entire planet was crammed and obstructed by the king's magnificent ermine robe。 So he remained standing upright， and， since he was tired， he yawned。
这一段中，So he remained standing upright这一句，remain是连系动词，那么作表语的standing应理解为动名词还是现在分词？