1. They're expecting us. They would be very disappointed if we .......   will not do not come did not come would not come

Để giải bài tập này, chúng ta cần sử dụng quy tắc cấu trúc ngữ pháp trong các cụm từ.

Câu trả lời cho câu hỏi trên là: "They would be very disappointed if we did not come."

Cách làm:
1. Sử dụng cấu trúc "would + V" cho câu điều kiện trong tường lai: They would be very disappointed if we did not come.
2. Dùng trạng từ phủ định "not" kèm với động từ "come" để tạo câu phủ định: They would be very disappointed if we did not come.

They're expecting us. They would be very disappointed if we did not come.

They're expecting us. They would be very disappointed if we would not come.

They're expecting us. They would be very disappointed if we did not come.

They're expecting us. They would be very disappointed if we do not come.