I am是动词to be现在时的第一人称单数。
'I am' is the first person singular of the present tense of the verb 'to be'.
它总是使用动词第三人称单数的形式，尽管在英语中它的动词总是复数。
It always takes the third person singular form of the verb even though it's always plural in English.
自恋的人会在社交网站的“关于我”区域中上传更多能够提升自我形象的照片，使用更多的第一人称单数。
Narcissists' profiles tend to feature more self-promoting profile photos and first-person singular pronouns in their “About Me” sections.
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