识别并应用规则动词的过去式形成规则（-ed 贴纸）。 Identify and apply the regular formation rules for the past tense (-ed sticker transformation).
通过互动卡片翻转记忆常见的不规则过去式动词。 Memorize common irregular past tense verbs through interactive card flips.
理解助动词 'Did' 如何充当“吸尘器”将主语变回原形。 Understand how the auxiliary verb 'Did' acts like a 'vacuum cleaner,' transforming the main verb back to its base form.
构造简单过去式的肯定句和否定句。 Construct simple affirmative and negative sentences in the past tense.
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