把肯定句改成双重否定句

①这次考试他考得很好。

②信赖，往往创造出美好的世界。

有时候我发现学英语的确很难。

Sometimes I____ ____really hard____learn English．

    Hi, my name is Sam. I have a big family. Charles is my father and Janet is my mother. I have two sisters. My sister Sara is 16. Anna is 14. I'm the youngest in my family. I'm 11.

    Hi, my name is Charles. My parents are Paul and Susan. I have one brother and one sister. Gary is my brother's son. My sister Laura has two daughters. They are Dina and Kate.

根据材料内容选择最佳答案。