1. It is very unpleasant waking up and hear the rain beating on the windows.
 * Lỗi: Sai thì của động từ. Sau "and" phải là động từ cùng thì với động từ trước.
 * Sửa: It is very unpleasant waking up and hearing the rain beating on the windows.
2. When I met him this morning he has invited me to dinner with his family this Sunday.
 * Lỗi: Sai thì của động từ. Sự kiện mời xảy ra trước khi gặp, nên dùng quá khứ hoàn thành.
 * Sửa: When I met him this morning, he had invited me to dinner with his family this Sunday.
3. More and more trees cut down to make paper and to build houses.
 * Lỗi: Thiếu chủ ngữ cho động từ "cut down".
 * Sửa: More and more trees are cut down to make paper and to build houses.
4. Information in a computer can be lost because it is not longer stored or it cannot be retrieved.
 * Lỗi: Dùng sai từ. "Longer" không đúng ngữ cảnh ở đây.
 * Sửa: Information in a computer can be lost because it is no longer stored or it cannot be retrieved.
5. During I was talking to Barbara, I learned that Tony was in hospital.
 * Lỗi: Dùng sai giới từ.
 * Sửa: While I was talking to Barbara, I learned that Tony was in hospital.