2. I've never seen a taller boy than Michael.
3. Michael is the tallest boy I've ever seen.
4. No other boy I've ever seen is as/ so tall as Michael.
5. There is no boy I've ever seen as/ so tall as Michael.
6. I've never seen as/ so tall a boy as Michael.
The difference between #1 and #2 is that in the latter, you're leaving the possibility open of having seen a boy exactly as tall as Michael. Sentence #3 means the same as #1. " Sentence #4 means the same as #1 and #3.
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The difference between #1 and #2 is that in the latter, you're leaving the possibility open of having seen a boy exactly as tall as Michael.
Sentence #3 means the same as #1.
In #4, #5, and #6, use "as" instead of "so."
Sentence #4 means the same as #1 and #3.
Sentence #5 is unnatural.
Sentence #6 means the same as #1, #3 and #4.