Ответ:

1. I haven't done (not do) aerobics before,but I have tried (try) something similar.

2. Has Derek directed (direct) a film before?

3. Janet and Olivia haven't finished (not finish) their art course yet.

4. Ewan has planted (plant) an apple tree, but it hasn't produced (not produce) any apples yet.

5. Have you brought (bring) your umbrella with you?

6.Professor Smith has made (make) a new robot but I don't know what it does.