1. 状语 + 谓语：例如：When I arrived, he was playing the piano.
2. 名词/形容词性物主代词 + be动词 + 动名词：例如：His being here is a great help.
3. 名词/形容词性物主代词 + have/has + 过去分词：例如：Their having finished the work made me happy.
1. 状语 + 谓语：例如：When I arrived, he was playing the piano.
2. 名词/形容词性物主代词 + be动词 + 动名词：例如：His being here is a great help.
3. 名词/形容词性物主代词 + have/has + 过去分词：例如：Their having finished the work made me happy.
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