1. I have bought a laptop but I haven't used it.
2. I have written a blog but I haven't uploaded any photos to it.
3. We have started the game at half an hour ago but we haven't finished it.
4. My dad have been to London but he haven't seen Big Ben.
Có gì sai sót bỏ qua cho Trân nha^^
Còn nếu được xin câu trả lời hay nhất nhé