The document discusses the differences between the adverbs "just" and "only" in English. It provides examples of how each can be used: 1) "Just" can indicate a brief preceding time period or that something was done recently or immediately. Examples given are "I've just seen her" and "Just now." 2) "Only" also means "solely" or "exclusively" and can sometimes be used interchangeably with "just." The example given is "He's just a boy" vs "He's only a boy." 3) "Only" has another meaning of being the "one and only," like in the phrase "He is an only child."