Употребить в правильной форме present perfect, present continuos, 1)what are you(to do) here? - i am (to write) a letter to my friends? 2) who (to write) hus artiete? 3)what language you (to study)? 4) we (to learn) a lot of english words ( a lready) 5) what she (to iteach) them? 6) what just (to do) some thing for us 7) you (to find) the book?

1)What are you doing here? - I am writing a letter to my friends

2) Who have written hus artiete?

3)What language you are studing?

4)We has already learned a lot of English words

5)What she has iteached them?

6)What have just done something for us

7)Have you found the book?

Как-то так, но вот некоторые слова в вашем запросе с ошибками например hus artiete