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1. A while:

   • "A while" is a noun phrase that consists of the article "a" and the noun "while," where "while" refers to a period of time. It indicates a duration or length of time.
   • Example: "He waited for a while before leaving." Here, "a while" refers to a period of time during which he waited.
   • Example: "They haven't seen each other in a while." In this sentence, "a while" refers to a length of time during which they have not seen each other.

2. Awhile:

   • "Awhile" is an adverb that means "for a while" or "for a short time." It is used to describe an action or state that occurs or continues for a period of time.
   • Example: "She sat awhile and then got up." Here, "awhile" describes how long she sat, indicating that it was for a short time.
   • Example: "He paused awhile to catch his breath." In this sentence, "awhile" describes the duration of the pause, indicating that it was for a short time.