A really good question
got posted on ELL about why some present perfect sentences on the internet have preposed verb phrases that don't use past participles (main verbs that have been moved to the front of the sentence that aren't past participles even though the auxiliary verb is have). Here's the example:
- Of course, they had the considerable advantage of being able to see what worked well and what didn't work so well in Java, and build upon that, but build they have.
It's quite a sophisticated question, really, definitely one worthy of any linguist or serious enthusiast of English language. However, there was an even more interesting type of similar example that sprung to mind for me:
- They said that I wrote it, and wrote it I did.
In this example, if it's grammatical, we see the verb form wrote as a complement of the verb did. As in the example before, it has been preposed. Normally, when we see another verb as the complement of did, we expect to see a verb in the plain form. Here, it's in the past simple form.
Now, while there are vetted grammar sources which talk about the first type of example, there are none that I know of, or have been able to find, that talk about the second, so I wanted to know what other linguists thought about this example. So I posted a question here on EL&U.
However, in a way, my question derives from Cookie Monster's question (they're the poster on ELL). Here's a picture of them so that they get the recognition they deserve:

Anyhow, to let them know about the question I was posting here, to pep them up, I left a tongue-in-cheek comment to make them feel good (which they deserved to do) under their post. After all, why wasn't I posting the question there on ELL? The answer is that I think this particular question (not the original) needs the attention of some dedicated linguists or language enthusiasts.
I am sorry for making warm and friendly tongue-in-cheek comments to learners on ELL, especially if it offends the linguists on this site, and never again will I joke about ELL posters being even better than EL&U ones - because that wouldn't be funny for an ELL learner who's trying to learn English. Sorry.
I'm going to stand in the corner and flagellate myself with whips twisted together from medieval Latin dictionaries.