PHONETICS: / ʃ, ʒ ,tʃ and dʒ /

The /tʃ/ sound in English is most often represented by the initial/final letters 'ch', while/dʒ/ commonly appears as initial/final 'j', 'g', or 'dg'. 

The sounds /ʃ/ and /ʒ/ 

The /ʃ/ sound in English is most often represented by the letters 'sh'. The /ʒ/sound occurs less frequently in speech. It is is most often represented by the letter 's' and pronounced almost the same as /ʃ/ except it is voiced (between vowels).