It is believed that in the progress of learning and teaching a foreign language, CA cannot be omitted. CA although is old, is still relevant in assisting language teachers with their teaching methods and techniques. The differences assist the learners get through the similarities and discrepancies between his mother tongue and the target language in order to enhance his knowledge. What do you think of contrasting and comparing two or more languages in terms of morphology and phonology for EFL and ESL learning and teaching?