Nakereba narimasen! Konnichiwa minasan! Watashi wa "nakereba narimasen" wo wakarimasu demo... watashi wa eigo wo hanashimasu, nazenara watashi no nihongo wa totemo warui desu! >.< Sumimasen! I mean, I understan how to use "nakereba narimasen" such as: i must... but i don't know how to say: I mustn't~ What's the form? "Nakereba narimasen" is a double negative form, isn't it? Arigato gozaimasu anatatachi no tetsudai >.<