Question

They took away the knife so that the boy should

They took away the knife so that the boy shouldnot hurt himself的句子成分

Answer 1

They是主语 took away是谓语' the knife 是宾语。后面是目的状语从句作目的状语so that 是引导目的状语从句的连词（该连词引导的状语从句含情态动词是目的状语，不含情态动词是结果状语）the boy 是从句中的主语shouldnot hurt是从句中的谓语 himself是从句中的宾语。

句子意思：他们夺走了刀 以免这个男孩伤了他自己。（以便这个男孩不伤害他自己）

Answer 2

他们把刀夺走了，所以这个男孩不能伤害他自己。