The refugees were grateful for whatever they received, from the given sentence the noun clause is "whatever they received."
A noun clause is a dependent clause that functions as a noun in a sentence. It can act as the subject, object, or complement of the verb. In this sentence, the noun clause "whatever they received" is acting as the object of the preposition "for." It is answering the question "for what?" Noun clauses are often introduced by subordinating conjunctions such as "what," "whatever," "who," "whom," "which," "that," "whether," and "if."
In this case, "whatever" introduces the noun clause and functions as a pronoun that refers to an unspecified thing. The noun clause "whatever they received" represents the things that the refugees received. It emphasizes that the specific items received are not important; rather, it emphasizes the refugees' gratitude for whatever they were given. So therefore from the given sentence the noun clause is "whatever they received."
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