what's the differences these words? arimasuka desuka imasuka

what's the difference bewteen imasen and imasuka?

what's the difference bewteen arimasuka and imasuka? what's the difference bewteen nandesuka and imasuka?I'm not sure that it is nandesuka or desuka.

what's the diffence bewteen sensei and kyoushi? what's the diffence bewteen watashi and boku?

vocabulry what' the meaning of these phrase? nonde 、yonde、tabete kuroi katte nandasuka kusa shite I learn japanese with the Rosetta stone. It didn't tell the meaning of these phrase.I am sorry that i was lazy.

favourite book I was a girl who very like to read book. I thought book is a useful for us to know about other coutries culture and history. I don't have favourite book. I have read lots of book in a way. But i thought that i need to read much book. What do you think?

what's the diffences bewteen imasuka and desuka?

First notebook entry: Introducing myself I am a Chinese student from Guangdong Province . I study in the senior high school. I am going to study in the university in two years. I know i need to improve my engish ability if i want to study well . So i came here and introduce myself to all of you. I hope you can help me improve my english ablity . That's all. Thank you.