TION - after a long vowel, spell /shun/ as tion: quotation, substitution, discrimination, accommodation, communication, deletion, investigation, SION- only one way to spell /zhun/. After ANY vowel, sion says /zhun/: decision, revision, collision, invasion, confusion, conclusion, illusion, TION or S+SION - after a short vowel, spell /shun/ TION or S+SION. Look it up.: competition, transmission, demolition, ambition, confession, admission, concession,

Barton 5.7 -tion or -sion (part 1)

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