The main difference is that "since" indicates when something started, while "for" indicates the duration or length of time. "Since" points to a specific starting point, while "for" focuses on the overall time period.
No, you cannot use "since" and "for" interchangeably. They have distinct meanings and usages. "Since" is used to indicate when something started, while "for" is used to indicate the length of time something has been happening.
Context matters in English because the meaning of words can vary based on the surrounding words, phrases, or situation. Words often have multiple meanings, and the intended sense becomes clear through the context in which they are used.
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