Looking up again. -us is the male word in nominative, and -os is its accusative ending. I've made mixed them up more than once.
(By the way, how do you get tables into the comments? Thanks for answering, PauloChen2! I've edited my text above, into a table)
You can use GitHub-flavored Markdown table syntax for constructing tables here
That seems to be true. I just tried the example from
| Tables | Are | Cool |
| ------------- |:-------------:| -----:|
| col 3 is | right-aligned | $1600 |
| col 2 is | centered | $12 |
| zebra stripes | are neat | $1 |
|col 3 is||right-aligned||$1600|
|col 2 is||centered||$12|
|zebra stripes||are neat||$1|
However, in general, I would caution against going to the GitHub site for guidance to Duolingo Markdown, since Duolingo uses a unique dialect of Markdown.
The best place to find Duolingo Markdown information seems to be
After going through this course (I've only just get checkpoint 1 and into Market lessons) multiple times refreshing my lesson circles it's now become apparent to me just how strange it seems, in the Latin language, to have "Ego... habeo", together and is inclined to be an emphasis.
egō is subject to "iambic shortening." See here:
This whole article is filled with interesting stuff, although what it says about long vs. short vowel quality in classical Latin is disputed.