她昨天下午一直在给朋友写信。
She was writing a letter to her friend yesterday afternoon.
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was英 /wɒz/|美 /wɑz/
writing英 /ˈraɪtɪŋ/|美 /ˈraɪtɪŋ/
解释
was + writing 构成过去进行时，表示过去某段时间（昨天下午）持续进行的动作。
She was writing a letter to her friend yesterday afternoon.
was + writing 构成过去进行时，表示过去某段时间（昨天下午）持续进行的动作。