英语的情态动词具有自己的词义,能表示说话人对所说动作或状态的看法、或说话人的主观设想。由于其主观性,往往对于词义的情绪强弱和表示说话者对某一问题的主观把握或精确程度方面,不易掌握含义上的微差。在科技英语教学中,为了帮助学生准确把握这种微差,可试用定量分级的方式介绍这种差异。 English modal verbs have their own meaning and can represent the speaker’s view of the action or state, or the speaker’s subjective assumption. Due to its subjective nature, it is often difficult to grasp the slight differences in the meanings of the emotional strengths of the word meanings and the subjective grasp or accuracy of the speaker on a certain question. In science and technology English teaching, in order to help students to accurately grasp the slight difference, we can try to introduce the difference in the way of quantitative classification.