TION - after a long vowel, spell /shun/ as tion: quotation, completion, communication, dictation, SION- only one way to spell /zhun/. After ANY vowel, sion says /zhun/: collision, explosion, confusion, TION or S+SION - after a short vowel, spell /shun/ TION or S+SION. Look it up!: transmission, admission, infection,

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