Darbas anglų kalba. Anglų filologija. Anglų kalbos idiomų klasifikacija. Introduction. The concept of idiom. The term "idiom". Characteristic features of idioms. The usage of idioms. Differences between free-word groups and idioms. Classification of idioms. Classification principles of phraseological units according to V. V. Vinogradov. Formation of phraseological units by A. V. Koonin. The functioning of idioms in belles-lettres texts. Conclusions. Summary in Lithuanian.