In English, "现金" is referred to as "cash".
If you want to ask about the use of cash in a sentence, here are some examples:
"I always carry cash with me when I go shopping." (I always carry cash with me when I go shopping.)
"The store only accepts cash payments." (The store only accepts cash payments.)
"Don't forget to bring your cash for the dinner tonight." (Don't forget to bring your cash for the dinner tonight.)
