* The wind was howling outside, it was warm and comfortable indoor.
   * Sửa: The wind was howling outside, but it was warm and comfortable indoors.
   * Giải thích: Cần dùng liên từ tương phản "but" để nối hai vế câu mang ý nghĩa đối lập.
 * The highway was under construction, we had to take a different route to work.
   * Sửa: The highway was under construction, so we had to take a different route to work.
   * Giải thích: Sử dụng liên từ "so" để thể hiện mối quan hệ nguyên nhân - kết quả.
 * You could fly via Singapore; this isn't the only way
   * Sửa: You could fly via Singapore; however, this isn't the only way.
   * Giải thích: "However" được sử dụng để giới thiệu một thông tin trái ngược với câu trước.
 * There is still much to discuss. We shall, return to this item at our next meeting.
   * Sửa: There is still much to discuss. We shall return to this item at our next meeting.
   * Giải thích: Bỏ dấu phẩy thừa sau "shall".
 * It isn't that he lied exactly, he did tend to exaggerate.
   * Đúng ngữ pháp: Câu này đã đúng ngữ pháp.
 * 1 thought the plane would be delayed; I bought a lot of magazines to read.
   * Sửa: I thought the plane would be delayed, so I bought a lot of magazines to read.
   * Giải thích: Sử dụng "so" để thể hiện mối quan hệ nguyên nhân - kết quả.
 * Jackson was going to study all night, he declined our invitation to dinner.
   * Sửa: Jackson was going to study all night, so he declined our invitation to dinner.
   * Giải thích: Sử dụng "so" để thể hiện mối quan hệ nguyên nhân - kết quả.
 * We thought the figures were correct. we have now discovered some errors.
   * Sửa: We thought the figures were correct. However, we have now discovered some errors.
   * Giải thích: Sử dụng "however" để giới thiệu một thông tin trái ngược với câu trước.
 * Cars have become more complicated. mechanics need more training than in the past
   * Sửa: Cars have become more complicated, so mechanics need more training than in the past.
   * Giải thích: Sử dụng "so" để thể hiện mối quan hệ nguyên nhân - kết quả.
 * We arrived at the theater late. the play had not yet begun. We were quite surprise
   * Sửa: We arrived at the theater late; however, the play had not yet begun. We were quite surprised.
   * Giải thích: Sử dụng dấu chấm phẩy và "however" để nối hai câu có quan hệ tương phản.
 * Prices have been rising. It is unlikely, that this increase will continue.
   * Sửa: Prices have been rising. However, it is unlikely that this increase will continue.
   * Giải thích: Sử dụng "however" để giới thiệu một thông tin trái ngược với câu trước.
 * The bread was old and stale, Martha ate it anyway.
   * Đúng ngữ pháp: Câu này đã đúng ngữ pháp.
 * The holiday had been a complete disaster. We, decide to fly home early if we could.
   * Giải thích: Sửa "decide" thành "decided" để phù hợp với thì quá khứ.
 * He failed the exam, he had to do the job he didn't like.
   * Sửa: He failed the exam, so he had to do the job he didn't like.
   * Giải thích: Sử dụng "so" để thể hiện mối quan hệ nguyên nhân - kết quả.