HSK 3 · classifier
封
measure for letters
他收到了三封信。
Tā shōudàole sān fēng xìn.
He received three letters.
我给朋友写了一封信。
Wǒ gěi péngyou xiěle yì fēng xìn.
I wrote a letter to my friend.
我给他写了一封回信。
Wǒ gěi tā xiěle yì fēng huíxìn.
I wrote him a reply.
他把邮票贴在信封上。
Tā bǎ yóupiào tiē zài xìnfēng shang.
He stuck the stamp on the envelope.