1.I found an interesting book.- I didn't find an interesting book.
Did you find an interesting book
2.There were some boys in the room.- There aren't any boys in the room.
Are there any boys in the room
不明白的再问哟,请及时采纳,多谢 !我还想问问。Liu Mei was a teacher. He did his homework.liu Mei wasn't a teacher.Was Liu Mei a teacher ? He didn't do his homework.Did he do his homework ?