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.