A story built one clause at a time/guide

Here's a guide on what counts as a clause in A story built one clause at a time.

• My friend and I
  • Doesn't count. It's just a subject.
• Am with my dog
  • Doesn't count. It's just a predicate.
• I am Steve
  • Counts. It contains both a subject and a predicate. It's an independent clause.
• After I walk home
  • Counts. A dependent clause, but still a complete clause.
• After I walk home, I'll become Steve
  • Doesn't count. Contains two clauses, even though only one would form a correct sentence on its own.
• Yay!
  • Counts. It's a complete sentence due to it being an interjection.
• Firstly, this article sucks.
  • Counts. "Firstly" isn't a clause.
• I wrote this garbage, then I
  • Doesn't count. Although it is only one clause, it also contains a phrase.
• I wrote this garbage, then
  • Doesn't count. It is only one clause, but it contains the beginning of another clause.