I have a hard time doing sth.这句里的"doing sth"是什么成分?现在分词作time的定语吗?

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• I have a hard time doing sth.这句里的"doing sth"是什么成分?现在分词作time的定语吗?
• I have a hard time doing sth. 这句里的"doing sth"是什么成分?现在分词作time的定语吗?
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