Ответ:

1) Have completed.

2) Have you ever tried?

3) Haven't written.

4) Have you already buyed?

5) Have translated.

6) Has seen.

7) Have known.

8) Have been.

9) Have you cooked?

10) Have eaten.

11) Hasn't seen.

12) Have you been?

13) Has visited.

14) Have knitted.