"As $500 is not really big amount, it makes my pick really difficult and requiring" Theoretically, a present participle can be used as an adjective. But your sentence is not correct. Here is an example: Requiring a fresh battery for his phone, he went into the electronics store.
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Marold1) Is it possible to use word "requiring" in function of adjective?"As $500 is not really big amount, it makes my pick really difficult and requiring"Theoretically, a present participle can be used as an adjective. But your sentence is not correct.