这个单元一定要体会过去进行时的真正含义和用法.要避免混淆过去时和现在进

This unit must understand the true meaning and usage of the past tense. To avoid confusion between past tense and present tense and when/while lead time adverbials. Following the laws of cognition, the first lesson is only a preliminary perception, imitating

This module must appreciate the true meaning and usage of past conduct. Avoid confusion between past and present time and when and when when and when when and when-while-guide-time phrases. Follow the cognitive law, the first lesson is just preliminary perception, imitation

This unit must understand the real meaning and usage of the past continuous tense. It is necessary to avoid confusing the past tense with the present continuous tense and when / while guiding time adverbials. Following the cognitive law, the first class is only a preliminary perception and imitation<br>