Jiéhūn yǐhòu tāmen hěn ēnqíng.
False: 结婚以后他们很恩情。
Jiéhūn yǐhòu tāmen hěn ēn'ài.
True: 结婚以后他们很恩爱。
汉语里，“恩情”是名词；“恩爱”是形容词，指夫妻之间的感情。此句应把“恩情”改成“恩爱”，作谓语。
恩情 is a noun. 恩爱 is an adjective describing the affection between husband and wife. The right word to function as the predicate of the sentence should be 恩爱.
