Idioms are metaphorical expressions that cannot be translated literally. They are widely used in English because they make everyday speech more interesting and entertaining for native speakers. It is assumed that there are about twenty-five thousand idiomatic expressions in English and one of the most common thematic areas for idioms is colour. Idiomatic expressions are a fun way to enhance the vocabulary and cultural knowledge of learners of English. However, mastering these expressions cause difficulties for students not only because their meaning is not deductible from the meanings of the words comprising it, but also due to the different meaning of colours in the cultures around the world. For instance, purple is usually connected with aristocracy, affluence, and piousness across the globe but in Thailand and Brazil it is the colour of bereavement. In this article we have described an approach to check the acquisition of idiomatic expressions and facilitate their long-term retention by using online practice tests. These tests are designed by the teacher and taken by students on their personal computers or mobile phones at their own convenience. Furthermore, specifically developed criteria for test construction are listed together with typical test questions based on them. Examples of test items are presented to illustrate the process of test creation. Finally, an appendix of a selection of the most widely used idiomatic expressions with colours is compiled.
Mathematical model for knowledge testing
