I have been working hard all morning 我辛苦工作了一个上午为什么要使用动名词working have+been算复合谓语吗？复合谓语好像是have+be（原形的）这边为什么要使用后置定语hard来 而不是 hard working?

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• I have been working hard all morning 我辛苦工作了一个上午为什么要使用动名词working have+been算复合谓语吗？复合谓语好像是have+be（原形的）这边为什么要使用后置定语hard来 而不是 hard working?
• I have been working hard all morning有没有什么语法错误有have been working这种说法吗
• i've been studying history in china短文缩写70词左右My name is leo,I'm form australia,and i've been teaching in china for two years ,i teach in harbin,the capital of heilongjiang province,this is an interesting city with a very colorful history,there is some european in fluence in the city,and some of the old buildings in harbin are in russian style.sionce i came to china ,i've been learning a lot about my family history,although I'm australian ,my family is