No matter when they came from or what their previous lifestyle is, the refugees were grateful for having been granted political asylum in the United States. No error.
请看what their previous lifestyle is这段话， their跟lifestyle的单复数不同，当然还有后面的is也一起错了。应该改成lifestyles are.
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名词(包括代词)。单复数问题。
判断方法：对比主语跟宾语。主语跟宾语的单复数形式必须相同。也可能会根据谓语或者定语进行判断。下面是例题。
No matter when they came from or what their previous lifestyle is, the refugees were grateful for having been granted political asylum in the United States. No error.
请看what their previous lifestyle is这段话， their跟lifestyle的单复数不同，当然还有后面的is也一起错了。应该改成lifestyles are.