Stammering began to grow on him .

他的口吃越来越厉害了。

She was unprepared , stammering and unsure in her classes .

她毫无准备。说话结结巴巴，对讲授的课程没有把握。

His mind was stammering and his hands twitching .

他心里正觉得讷讷不能出口，他的双手在抽动。

He was stammering with fright .

他因害怕而口吃起来。

One night a blushing , stammering young man of letters was introduced to him .

有一天晚上，人们介绍给他一个腼腆的、口吃的年轻文学家。