It seems like an adjective in those phrases. Early用法： 一、early可以用作副词 early用作副词意思是“早；先；提早”,也可作“在初期，在早期”“从前，古时候”解。 early在句中可用作状语，主要修饰动态动词，也可修饰名词或介词。 二. Hi, we all know that one month has three sections which are defined as early/middle /late +month, for example:
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Are you sure that 'early' is an adverb?
我比其他人早来三小时。 the ship arrived 30 minutes early.
At early morning is wrong (although at dawn works, since dawn is a particular moment). Early是副词，a few hours early不构成词组，是中国式的英语。 请看下面两个例句： i came three hours earlier than the others.
