Since:
1. I have read this book since last month.
2. She has lived in Russia since 1987.
3. He hasn't talked to her since last party.
4. I haven't watched movie since we went to the cinema in July.
5. I haven't liked anyone since I met her.
For:
1. She has worked here for 6 months.
2. I haven't seen Nick for 3 days.
3. The house has been empty for 2 years.
4. She has been pregnant for 8 months.
5. He has helped me with homework for 4 hours.
