3.
1. He doesn't know Chinase. So do I.
2. I have already seen this film. So he is.
3. We are going to buy a tent. So they are.
4. I don't like this book. So she is.
5. Lena didn't work yestarday. So did Masha.
4.
1. She doesn't speak neither English nor Russian.
2. Both Genna and Henry are ill.
3. Linda isn't neither secretary nor manager.
4. He didn't neither write nor call me.
5. The book is both interesting and funny.
6. Both Masha and Misha don't look like their fathers.
7. Both Jane and Doris are often late for school.