Can but begin a sentence?
Some people object to the use of but, like and, at the beginning of a sentence, regarding it as a joining word that has to have words on either side of it. This is a mistaken notion with no foundation in English structure and usage. It is, however, advisable to reserve this use for occasions when the special effect that initial position affords is needed; otherwise it can become an awkward affectation.
But is not usually followed by a comma. A comma may precede but when an independent clause follows, thus: I wanted to leave early, but [not but,] the rest of the group did not.
Avoid unnecessary redundancy in using but and other terms such as however together.
When but is used to indicate an exception, as in No one but me has (or No one but I have) seen the document, either wording can be used, according to your interpretation of the function of but: is it a preposition, as in the first variation, or is it a conjunction, as in the second variation? Though strong cases have been made for both wordings, the prepositional wording does carry slightly more weight. You can recast the sentence as No one has seen the document but me, where its prepositional function is quite clear.
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