…at what they’ve just written, and at the squiggly lines that word processors generate under questionable word choices and grammatical errors, this is an example of what you get:
(From a recent student paper.)
Actually, most of my recent students have been good about proofreading. Examples like this one stand out to me partly because they aren’t that common, but partly, also, because I don’t understand why they happen at all. That is, I can’t imagine what it takes to turn something in without (a) noticing these markings, and/or (b) caring to address them.
We’re still a long way from routine, sentence-level revisions!