Remember when you are talking about the past, you use the past forms of the verbs, e.g.
记住当你谈论过去的事情时，用动词的过去式。
Speaking of the knacks, when you know the past forms of some irregular verbs, you will find some rules.
要说窍门，在多背一些动词的不规则过去式后，你会发现还是有一些规律的。
Find out the past forms of the following words in the vocabulary.
从词汇表中找出下列单词的过去式。。
Find out the past forms of the following words in the vocabulary.
从词汇表中找出下列单词的过去式。。
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