Раскройте скобки,употребляя глаголы в требующейся форме так чтобы получить Present Continuous или Present perfect. 1)What

1)What are you doing (Present Progressive) here? — I am writing (Present Progressive) a letter to my friends. 2. Who has written (Present Perfect) this article? — 3. What language are you studying (Present Progressive)? 4. We have already learnt (Present Perfect) a lot of English words. 5.What is she teaching them (Present Progressive)?