1.ThemathproblemissodifficultthatIcan'tworkitout.(改为简单句)Themathproblemis______
1.ThemathproblemissodifficultthatIcan'tworkitout.(改为简单句)
Themathproblemis_______difficult___________________________out.
2.Thedoctordiedtendaysago.(改为现在完成时态)
Thedoctor_____________________________tenyearsago,
3.PeopleuseChineseasthefirstlanguageinChina.(改为同义句)
Chinese______________________thefirstlanguageinChina.