Sally had to finish her homework before dinner.(改为否定句)
Sally                to finish her homework before dinner.
My mother prefers to pay for things by credit card.(对划线部分提问)
your mother prefer to pay for things .
The driver and the injured passengers were sent to the hospital immediately. (保持句意基本不变)
The driver and the injured passengers were sent to the hospital                    .
The bookcase was too heavy for little Susan to lift.(保持句意基本不变)
The bookcase was           heavy          little Susan couldn’t lift it..
“Have you finished your project on France?” asked Tom.(改为宾语从句)
Tom asked          I            finished my project on France.
The school shouldn’t allow students to take iPads to school.(改为被动语态)
Students shouldn’t                      to take iPads to school
a fireworks, show, end, the festival, with ,will(连词成句)