Question

highlight the subordinating conjunction (\swabi\) in the sentence.
because luigi will be out of town next weekend, i didnt invite him
to my party.

Explanation:

Subordinating conjunctions (like those in the "SWABI" mnemonic - Since, When, After, Before, If) introduce subordinate clauses. In the sentence, "Because" is a subordinating conjunction that introduces the subordinate clause "Because Luigi will be out of town next weekend" to explain the main clause "I didn't invite him to my party".

Answer:

Because