Stemming is the process of finding the constant part of a word, which is the fragment that stays the same no matter which word tense or mode is used.
确定词干是查找单词中不变部分的过程，它是单词中与时态和语气无关的保持不变的片断。
Yet another great way of relaxing is an exercise where you tense each muscle in your body, one body part at a time, and then let the tensed muscle relax.
另一个很妙的放松方法就是锻炼。锻炼能拉紧你的每块肌肉，每次锻炼身体的一部分，然后让紧绷的肌肉放松。
The second part is a review of the studies on tense as a grammatical category.
第二部分是概述时态作为语法范畴的研究。
The errors include part of speech, the component parts of sentences, tense, voice, and others.
错误类型包括词性、句型、句子成分、时态、语态等各种情况。
Part Three: Tense of the verbs.
第三部分，动词时态。
Part Three: Tense of the verbs.
第三部分，动词时态。
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