改为同义句。I am sure that I can work it out however hard the problem is.I am sure that I can work it out________ ________ ________hard the problem is.
It took him one and a half hours to finish the task.(变成同义句)
He one and a half hours the task.
China has a population of 1.37billion.(对划线部分提问)
the population of China?
She must be a doctor, ?(完成反意疑问句)
"Are you free to come to my place this Saturday?"Aaron asked me.(改为间接引语)
Aaron asked me free to go to his place that Saturday.
The scientists released the picture of a black hole to the world on April 10.(改为被动语态)
The picture of a black hole to the world by the scientists on April 10.