Because there are phonological variations in the way English is spoken, mainly due to geographic differences.

Phonological conditioning in English refers to the influence of surrounding sounds on the pronunciation of a particular sound. For example, the pronunciation of the "s" sound may vary depending on whether it occurs before a voiced or voiceless sound. This phonological conditioning can result in sound changes or alterations in English pronunciation.

The function of phonological rules in our life is to avoid misunderstanding and miscommunication words

English has vocal amplitude than Portuguese.

Edward Albert has written:

'A short history of English literature'

'History of English Literature'

'The story of English literature' -- subject- s -: English literature, History and criticism