现在分词是指：有动词原形+ing形式组成.具有双重性,一面具有动词的特征,可以有自己的宾语和状语；另一面具有形容词和副词的特征,可以充当表语,定语,状语,补足语,可以表示主动或正在进行的动作.
这个句子中when 应该是引导的一个时间状语,即表示在遇到问题的情况下.
刚那句话you'd better ask Mr.Wang for help when having problems.W
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