38 → There were such a large number of people that they made it impossible for me to see Tom.
39 . → It is set to storm next week according to weather forecasts.
40 → Had Jack not been taken by surprise, he wouldn't have fallen down.
→ Had it not been for his surprise, he would not have fallen down.

There were such a large number of people that they made it impossible for me to see Tom.
 It is set to storm next week according to weather forecasts.
 Had Jack not been taken by surprise, he wouldn't have fallen down.
 Had it not been for his surprise, he would not have fallen down.

Câu 38:
 * Câu gốc: There were so many people that I couldn't see Tom. (MAKE)
 * Câu hoàn chỉnh: There were such a crowd of people that I couldn't see Tom.
   * Giải thích: Ta sử dụng cấu trúc "such + a/an + (adj) + noun" để nhấn mạnh mức độ của một tính từ. Ở đây, "such a crowd" có nghĩa là "một đám đông lớn đến mức".
Câu 39:
 * Câu gốc: According to weather forecasts, we will have storms next week. (SET)
 * Câu hoàn chỉnh: It is set to be stormy next week, according to weather forecasts.
   * Giải thích: Cấu trúc "It is set to be + adjective" được dùng để diễn tả dự đoán về một tình huống sắp xảy ra. Ở đây, "set to be stormy" có nghĩa là "dự kiến sẽ có bão".
Câu 40:
 * Câu gốc: Jack was so surprised that he fell down. (TAKEN)
 * Câu hoàn chỉnh: Jack was taken aback by the surprise.
   * Giải thích: Cụm từ "taken aback" có nghĩa là "bất ngờ đến mức sững sờ". Câu này ngắn gọn hơn câu gốc nhưng vẫn giữ nguyên ý nghĩa.