Though idioms often function as a metaphor, they are not considered to be one. Idioms require total familiarity with a culture in order to be correctly interpreted because the individual definitions of the words are not supporting the comparison. Instead, it relies on shared cultural references to make its point. This collection of worksheets will introduce your students to common English idioms. After finishing this section students should have a solid grasp on this skill and be ready to get to that next level of language development.
Project idea: Have your students choose a favorite idiom and research its origin. Note that some have many different theories as to where and how they developed. I bet you never could have guessed the history on that one?