按照要求进行句型转换。
1. The bus had left by the time I got there.(改为否定句)
The bus _______ ______by the time I got there.
2. He has already had breakfast. (改为一般疑问句)
______he had breakfast________?
3. The story was very interesting. I could never forget it. (合并为一句)
The story was ________interesting__________ I could never forget it.
4. She said, "I have read the book."(改为同义句)
She said that ______ read the book.
5. The box is so heavy that he can't carry it. (改为同义句)
The box is __________heavy for him __________ carry.
