Hi there!
1.A: I thought that coat was very expensive.
B: So did I.
2. A: I didn`t like her last single.
B: Oh, but I did.
3.A: I`m doing my homework at the moment.
B: So am I.
4. A: I don`t go swimming much.
B: Neither do I.
5. A: I`ve got really noisy neighbours.
B: I haven`t.
6. A: I went to a great restaurant last weekend.
B: So did I.