[答案]
MyfishissmallerthanJim's.
[解析]
考查陈述句的肯定形式。首先根据所给词汇及标点,可确定组合的句意是:我的鱼比吉姆的小。my fish我的鱼,做主语,放于句首;is是,放在主语后;smaller更小的;than比;Jim's吉姆的,放于句尾,结合英语的表达习惯作答。连词成句为:My fish is smaller than Jim's.
故答案为:My fish is smaller than Jim's.
[点评]
本题考查了"陈述句肯定形式,",属于"基础题",熟悉题型是解题的关键。