ch发音要是 /shi/,sh 发/shi/的音有很多,如:

sheep sheet shape shoot shot show dish fish shy shop

share shoe cash trash she shell Washington wash Welsh

dash splash cash rash rush shark fresh brush sunshine

shame wish shrimp shade perish push shout

ch 先说发 /shi/的音,如:

chagrin Chicago parachute moustache machine Michigan brochure chauffeur chaise chalet

champagne chambray chamois chandelier chapeau chaparral chaperone charade charlatan

Charlotte chauvinist chef chemise chevron chiffon chivalry chute cache crochet 

ch 发 /chi/的音也很多,如:

china cheap chip cheat teach kitchen chicken peach reach

breach chat champion chew crunch brunch French check chain chair charming chase chalk child chilly chief touch search which launch 等。