後(あと)でAfter, Later

あとで and まえに are both used to describe the timing of actions, but with opposite meanings. まえに usually follows a plain (non-past) verb and means 'before doing A' (e.g., 食べる前に = 'before eating'). In contrast, あとで typically follows the past tense form of a verb and means 'after doing B' (e.g., 食べたあとで = 'after eating').

Both あとで and たら can show that one action follows another, but their usage and nuance differ. あとで simply shows sequence, like 'after doing (A)'. たら adds a conditional nuance and can mean 'when' (temporal) or 'if' (hypothetical). Because of this, they are rarely interchangeable.

Both 上で and あとで express that one action follows another, but with different nuances. あとで simply shows sequence, like 'after doing (A)'. 上で implies the first action is a necessary step for the second, similar to 'upon doing (A)', and is more formal, often used in writing or business contexts.

前者は and 後者は, like あとで, relate to sequence, but in different ways. あとで (also written in kanji as 後で) refers to the order of actions, like 'after doing (A)'. 前者 and 後者 mean 'the former' and 'the latter', pointing back to the previously mentioned items.

てから and たら both convey a sequence of events, but their nuances differ. てから uses the Verb + て form to show that one event follows another. In contrast, たら follows the past tense (た form) and simply indicates that the second event occurred after the first, without implying any connection between the two.