What is the difference between always and forever? Are they synonyms used in different contexts or can they be used interchangeably?
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In some contexts they mean the same, but differ syntactically...
In other contexts there's a difference in that always usually means continuously, at all [relevant] times, whereas forever usually means for an infinite amount of time into the future. Thus...
...where some people may find that last construction more acceptable than others.
1: The song I Will Forever Love You does exist, but it's nowhere near as well-known as I Will Always Love You, written and first recorded by Dolly Parton, massively popularised by the late Whitney Houston.
Always: This word can be used to refer to the current habit. Maybe it'll change or end in the future.
Forever: This word can be used to refer to the action which never ends in the future.
Always generally refers to ongoing things while forever is a definitive way of saying that something will never end.