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John and I are old friends.

我和約翰是老朋友了。

How old are you?

你多大了？

How long have you lived here?

你住在這里多久了？

What was the weather like yesterday?

象昨天一樣的天氣？

Will it be convenient for you to explain your plans to him?

你向他解釋計劃將是方便的嗎？

He went to the post office to mail a letter.

他去了郵局寄信。