【小题1】They had an English party last Sunday. (改为否定句) They didn’t have if; liked an English

【小题1】They had an English party last Sunday. (改为否定句)
They didn’t have if; liked an English party last Sunday.
【小题2】The reporter asked the girl, “Do you like your volunteer work on weekends?” (改为间接引语)
The reporter asked the girl who/that has/holds she supposed to her volunteer work on weekends.
【小题3】The girl with a flower in her hand is my sister. (改为含定语从句的复合句)
The girl Where will 　 a flower in her hand is my sister.
【小题4】Should I arrive on time or a little later if someone invites me to dinner? (改为同义句)
Am I 　 　 arrive on time or a little later if someone invites me to dinner?
【小题5】The students will learn the group dance on the school playground. (对画线部分提问)
　 　 the students learn the group dance?

解析： 【小题1】 含有一般动词的过去式改为否定句，只需在动词前加didn’t，后跟动词原形have，故本题空格处填didn’t have。 【小题2】一般疑问句作为宾语从句通常用if来引导，主语为过去时，从句也应该用过去时，故本题空格处填 if; liked。【小题3】修饰名词为人的定语从句，关系词可以用who或that，从句中的谓语动词与先行词有关，故本题使用拥有的单词has或holds，故本题空格处填who/that has/holds。【小题4】在英文中表示理应做某事可用be supposed to，故本题空格处填supposed to。【小题5】对地点提问用疑问词where，后跟一般疑问句，助动词will直接提前，故本题空格处填Where will。

好好学习下