word choice - "So long as" vs. "as long as"
Which phrase is more formal — "so long as" or "as long as"?
Example:
- So long as Google Voice allows free long distance in North America, I will use it.
- As long as Google Voice allows free long distance in North America, I will use it.
I'm leaning toward 'as long as' but I have no justification.
Answer
I don't know that the distinction between these two is formality. I think that "so long as" indicates a logical predication, and "as long as" indicates a specific time interval. Take your two examples.
- So long as Google Voice allows free long distance in North America, I will use it.
I think this could be paraphrased as
- My use of Google Voice is conditional upon free long distance calls in North America.
Your second example was
- As long as Google Voice allows free long distance in North America, I will use it.
This could be paraphrased as
- For the duration of time that Google Voice allows free long distance in North America, I will be using it.
Thinking about it, I think that both "so long as" and "as long as" are used for the conditional reading, but only "as long as" can be used for the duration reading.
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