help person in trouble为什么in前不用加who were加或不加在语法或句子成分上有什么差别?

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• help person in trouble为什么in前不用加who were加或不加在语法或句子成分上有什么差别?
• fire can help people in many ways 中文翻译
• He likes to help others .He often gives money to poor people .He is very g___