1. I haven't heard him since August => I  2. I haven't seen him since I was a student => I last => The last time 3. It is the first time she has eaten this kind of meat => She has => She hasn't 4. I haven't eaten this kind of food before => This is the first => I have 5. This is the first time she has read this book => She has => She has not

1. I haven't heard him since August

=> I last heard him  was in August.

2. I haven't seen him since I was a student

=> I last saw him when I was a student.

=> The last time I saw him was I was a student.

3. It is the first time she has eaten this kind of meat

=> She has never eaten this kind of meat before 

=> She hasn't eaten this meat before

4. I haven't eaten this kind of food before

=> This is the first time I have eaten that kind of food .

=> I have never eaten that kind of food before 

5. This is the first time she has read this book

=> She has never read this book before 

=> She has not read this book before