The World Wide Web provides access to an extremely rich collection of written texts and transcriptions of dialogue from both current and historical sources. But I often have trouble searching for specific things.
I encountered this recently when I was looking at the word "so". I was interested in two particular uses of "so". One of them was the ubiquitous use of "so" to start a sentence. The other was a one word sentence form of so: "So?"
But I couldn't come up with with any way to structure a search in Google to narrow it down that much. Does Google have more precise search options that would let me do so, or are there other search engines that allow me to construct searches more precisely? I'd be satisfied to structure a query saying "Only show me uses of 'so' at the beginning of a sentence", which is adequate for my purposes even though I'd still have to weed out "So." and "So!".