How to correct/improve 's-' pronunciation at the beginning of a sentence?
As a native Spanish speaker, I tend to mispronounce some letters or words in English. One of them is the 's' sound at the beginning of a word, for example, I pronounce: - 'slang' as /eslaŋ/ instead of /slæŋ/, or - 'Spanish' as /ˈespan.ɪʃ/ instead of /ˈspæn.ɪʃ/, or - 'standard' as /ˈestandaɹd/ instead of /ˈstændəd/ I can easily hear the difference between /es/ and /s/, or between /eso/ and /es/, but I find really difficult to hear the difference between /espi/ and /spi/, because, I think, there is no /s/-CONSONANT-VOWEL sound in Spanish and my ears aren't use to hear such combination (so, my mind just create the /e/ sound at the beginning for consistence). So, my question is: Are you aware of any technique that help me to correct my pronunciation?, or any technique that help me to rewire my brain to be able to hear and pronounce better? Note: I took the IPA transcription from https://en.wiktionary.org