Comparison
Cause and effect
Problem and solution
Sequence
Description
These text structures are used to organize every text regardless of genre (e.g., expository, narrative) or content (e.g., science, social studies, current events, sports).
Answer:
could've
Explanation:
Could've is a contraction of could have, which is always correct. Could of will never be correct, and could of've is simply not a real term.