A loyal blog reader sent this to me from a Craigslist ad. What is most worrisome about this error is that they used the word “their” correct two other times IN THE SAME SENTENCE! Again, this is something spell check would not catch, so you need to actually read it (and know the difference between there and their). There is a location or at that place (she was sitting there on the blue chair) and their is belonging to them (he loved riding in their Corvette). And just to be complete, they’re is a contraction for they are.