way to write the sounds

When we 'write' a sound the right way to do it is using the phonogical way and the most extended way is the one proposed in the IPA (international Phonetic Alphabet), however, those symbols are not always used when we find information regarding synthetic phonics. What we normally find is the first way of writing the sound. For example, for the sound /i:/ we normally find it as the sound ee and for the sound /ʃ/ we may see it as sh.