Within the context of authentic English writing and speaking…
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Form and use possessives.
Spell grade-appropriate words correctly, consulting references as needed and/or using spelling patterns and generalizations (e.g., word families, position-based spelling, syllable patterns, ending rules, meaningful word parts).
Generalize learned spelling patterns when writing words (e.g., cage → badge; boy → boil).
Use commas in greetings and closings of letters.
Add prefixes and suffixes to base words (e.g., sitting, smiled, cries, happiness).