Correction ありがとうみんなさん。→みなさん、よろしくおねがいします。 1. We say みんな and みなさん. But we don't say みんなさん. みんなis a changed form of みな<everybody>. It's not a formal word. みなさんis a changed form of みなさま<皆様> and retains the original form "みな". さん／さま(honorific) doesn't match a casual form みんな. 2. よろしくおねがいしますI hope you will take care of me.＝Thanking you in advance. To sayありがとう is strange because you haven't known whether someone gives you a favor. It might be a correct expression in English. But in Japanese, we don't say "ありがとうThank you" before we know someone gives us a favor. Answer There are inflection and stress in Japanese too. But they are different to English. The unit of sound is not syllable. It's mora( 拍<はく>［haku］in Japanese). Mora is similar to beat or stroke. おばさん［obasaɴ］aunt / middle aged woman 3 syllables 4 moras おばあさん［oba：saɴ］grandmother / elderly woman 3 syllables 5 moras かた［kata］shoulder 2 syllables 2 moras かった［katta］won 2 syllables 3 moras かいた［kaita］wrote 2 syllables 3 moras English has a stress accent and Japanese has a pitch accent. We use pitch(height of sound) instead of stress. 雨<あめ> rain: あis high, め is low. It isミ(Me/E)ド(Doe/C) if I say with a musical scale. 飴<あめ> candy : あis low, め is high. It isド(Doe/C)レ(Ray/D) if I say with a musical scale. When we emphasize(put a prominence on) some part, we stress those place. それは　わたしのです！（あなたのでは　ありません）It's mine! (Not yours) ※わたしの（です）is pronounced stronger and higher than それは. A: だれが　いきますか。Who will go? B: わたしが　いきます。I'll go. わたしが　いきます。※だれが／わたしがis pronounced stronger and higher than いきます（か）. If you want further information, you can take my "Japanese Accent Rules" course. （^-^）