1. She has not eaten eel soup before.
-> S have/has not VPII before.
2. She has been writing for 30 minutes.
-> S have/has been Ving for ...
3. They have studied English since they were in grade 3.
-> S have/has VPII since ...
4. I haven't seen him for 3 weeks
-> S have/has not VPII for...
5. I haven't watched this movie for six months
-> S have/has not VPII for...