96. If they live in the area affected by air pollution, they have breathing problems.

97. I asked her if the Pyramids in Egypt attract a lot of tourists every year.

98. Nga said that she would hand in her assignment to the teacher the next day.

99. Mr. John said that they don't open the library today.

100. If I don't have free time, I can't go somewhere.

96, If they didn't live in the area by air pollution, they wouldn't hace breathing problems.
- Câu điều kiện loại 2
97, I asked her if Pyramids in Egypt attracted a lot of tourists every year.
- Câu tường thuật với Yes/No-questions
98, Nga said she would hand in her assignment to the teacher the next day
- Câu tường thuật với câu kể
99, Mr.John said they didn't open the library that day.
- Câu tường thuật với câu kể
100, If I had free time, I could go somewhere.
- Câu ĐK loại 2