There 26 letters in the English alphabet and 44 sounds in the English language.
There are 8 diphthongs (2 sounds in 1 syllable) and 3 triphthongs (3 sounds in 1 syllable).
diphthongs: [ei], [ai], [ɔi], [au], [əu], [iə], [ɛə], [uə];
triphthongs: [ juə ], [ aiə ], [ auə ].
Important differences between the English and Russian pronunciation:
1) In English there are long and short vowels.
2) There are no soft consonant sounds in English.
3) Voiced consonants are not devocalized.
4) There are diphthongs and triphthongs in English phonetics.