They change depending on the environment and surrounding sounds. English has irregular word endings. The rhythm of English is vastly different from that of other languages. Choral reading, songs, rhymes help children hear the rhythms of English. Overall, English does not sound the way it looks.
Spoken language contrasts with written language.
Final sounds, in particular, will change in context. The answer may vary greatly according to the learning context. In an ESOL setting, children with normal development and typical environmental exposure to the target language will usually learn to speak like native speakers without explicit pronunciation instruction. In an EFL setting, children s environmental exposure to English will vary widely and, in fact, the English class may be the only exposure they receive. Some teachers of EFL to younger learners are not fluent in the language themselves and may not provide models of pronunciation of English that are comprehensible to the English-speaking community.