they thought it was difficult to work them out改为否定句
they thought it was difficult to work them out改为否定句
it was very difficult for him to work out the problem改为同义句
it was very difficult for him to work out the problem 改为同义句
it is difficult for me to work out the physics problem改为同义句
They walk to work.改为否定句
I thought it difficult for me to work out the problem 如果对 是不
she thought that the work was too difficult to do it
They like other people to touch them改为否定句
The problem was too difficult for me to work out.改为复合句
It was very difficult for me to work out the math problem.同义
It is too difficult to work out the math problem.改为感叹句
1.It is not easy to work out the problem.(改为同义句) To work out