1.The math problem is so difficult that I can't work it out.

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1.The math problem is so difficult that I can't work it out.(改为简单句) The math problem is ______
1.The math problem is so difficult that I can't work it out.(改为简单句)
The math problem is _______ difficult _______ _______ _______ ______ out.
2.The doctor died ten days ago.(改为现在完成时态)
The doctor _______ ________ _______ _______ ten years ago,
3.People use Chinese as the first language in China.(改为同义句)
Chinese _______ _______ ________ the first language in China.

1 too for me to work
2 has been dead since
3 is used as

1.The math problem is so difficult that I can't work it out. The problem is so difficult that I can't work it out.同义句英语改句子The math problem is so difficult that we can't work it 同义句 The math problem is so difficult that nobody can work it The math problem is so difficult that［］students can work it the math problem is so difficult that he can'twork it out (改 The math problem was so difficult that I couldn't work it ou This problem is so difficult that we can't work it out.(保持句意 The math problem is so hard that we ean't work it out. The m The problem is so difficult that nobody can work it out(改为同义 This math problem is _____ that one.I can't work it out the problem is so difficult（） we can't work it out