Is it an MA thesis or an Honors thesis?
1. Grice conversational implicature and idiomatic expression. <too heavy for an Honors thesis, but fabulous for an MA thesis. Hmm, hasn't it been done already? You'll need to narrow it down some, which your adviser should help you with.>
2. Why do idiomatic expressions have to be separate from language teaching? <Are they taught separately? I have many colleagues who teach idioms as part of their individual ESOL lessons. We are/were taught to do it that way so as to show vocabulary and meaning in context. If teachers aren't doing that today, gee, I bet their students aren't all that satisfied.>
3. Is it important to teach idiomatic expressions formally in class? <That's a good topic for an Honors thesis, but for an MA thesis the topic is too thin.>
4. What's the best teaching method for non-native students (multiple intelligences, TPR)? <Agh. Old school. Not relevant today for an MA thesis, but would stand well as an Honors thesis.>