Pat did not take the bus home yesterday. 因为句子的谓语动词take 是行为动词，而行为动词作谓语的一般过去时的否定句要加助动词did not ( didn't ) 陈述句变否定句的方法： 1、句中有动词be (am , is ,are , was ,were)，情态动词（can /coul。
