L.3.2.e
Use conventional spelling for high-frequency and other studied words and for adding suffixes to base words (e.g., sitting, smiled, cries, happiness).
L.3.2.f
Use spelling patterns and generalizations (e.g., word families, position-based spellings, syllable patterns, ending rules, meaningful word parts) in writing words.
RF.2.3.d
Decode words with common prefixes and suffixes.
RF.3.3.b
Decode words with common Latin suffixes.