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tʃ
Words with an obvious tʃ sound
child, achieve, change, charge, cheap, cheat, chest, Manchester, chicken, chips, choke
(but not school, ache, anchor, character, echo; and not technical
words like chemical, architect, mechanical or archive)
much, catch, Dutch, fetch, match, touch, ouch, witch
(but not Scottish words like loch, or foreign names like Bach)
Words with a surprise tʃ sound
picture, nature, naturally, literature, torture, culture, vulture, cultural
(but not posture; and not actor, doctor, vector, etc)