Conjunctions

And, but, or, so, yet with a comma between two sentences, and because, although, since, unless, while, after to make complex sentences.

Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.

What children learn in Level 37

Conjunctions are joining words. And, but, or, so, and yet join two sentences into one compound sentence. Put a comma before the joining word.
Each one does a job. And adds more. But and yet show a difference. Or gives a choice. So tells a result.
Other joining words make complex sentences: because, although, since, unless, while, after, before, and when.
Because tells why. Although tells something surprising: although the water was cold, we jumped in anyway. Unless means it's the only way.
When the joining part comes first, put a comma after it. When the bell rang, we packed our bags. When it comes last, you usually don't need a comma: we packed our bags when the bell rang.

Georgia's K-12 English Language Arts Standards:

4.L.GC.1.39 — Grammar: Use subordinating conjunctions to join clauses. (Continue)
4.L.GC.2.b — Use a variety of simple, compound, and complex sentences to strengthen clarity and coherence, maintaining consistent verb tense within and between paragraphs. (C)