延续性动词和非延续性动词是英语教学中的一个难点，特别是完成式教学中的一个重点。
It is difficult to deal with durative and non-durative verbs in English teaching, especially when used in perfect tenses.
当的住在农村时，我常常为他担水。（延续性的动词）
When I lived in the countryside, I used to carry some water for him.
当的住在农村时，我常常为他担水。（延续性的动词）
When I lived in the countryside, I used to carry some water for him.
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