Beginning Japanese Phrases Podcast #191: ∼ なんです [used when explaining something or giving new information]
Beginning Japanese Phrases Podcast #190: ∼んです; ∼んだ [used when explaining something or giving new information; a casual form of のです/のだ; の (explanatory particle) relaxed intoん]
Beginning Japanese Phrases Podcast #188: ~てもいいですか? Is it OK to …?; may I …?; is it alright if (I) … ?; can I …? [“te-form V + もいいですか?]
Beginning Japanese Phrases Podcast #187: ~たい to want to; to wish to; would like to [“masu-stem V + たい”]