Помогите пожалуйста! Употребить в правильной форме Present Perfect, Present Continuos, 1) What are you…

1) What are you doing here? — I am writing a letter to my friends2) Who have written hus artiete? 3) What language you are studing? 4) We has already learned a lot of English words5) What she has iteached them? 6) What have just done something for us7) Have you found the book? Как-то так, но вот некоторые слова в вашем запросе с ошибками например hus artiete