1. Some of us have to study their lessons carefully if we expect to pass this examination. Lỗi: "their" nên được thay bằng "our" để phù hợp với chủ ngữ "us". Sửa lại: Some of us have to study our lessons carefully if we expect to pass this examination. 2. A five-thousand-dollars reward was offered for the capture of the escaped criminals. Lỗi: "dollars" không cần số nhiều và không cần dấu "-s" ở cuối. Sửa lại: A five-thousand-dollar reward was offered for the capture of the escaped criminals. 3. In 1837 Victoria, an eighteen-year-old woman, named queen of England. Lỗi: Thiếu động từ "was" sau "Victoria". Sửa lại: In 1837, Victoria was an eighteen-year-old woman named queen of England. 4. The tickets that you ordered they will be delivered tomorrow. Lỗi: Dư từ "they" sau "ordered". Sửa lại: The tickets that you ordered will be delivered tomorrow.