1.Mary likes this car.Her sister also likes this car.(合为一句）
Mary likes the same car as her sister does.
2.He ate some apples after he swept the floor last night.(改为同义句）
He has had some apples after he swept the floor last night.
3.He is too young to go to school.(改为同义句）
He is young that he can't go to school.
4.Ying Tian asked his teacher how he could play the violin well.(改为简单句）
Ying Tian asked his teacher how to play the violin well.
5.Your bike needs to be repaired.(改为同义句）
Your bike needs repairing.