586. How long has it been since you've heard from your uncle?
从你上次接到你叔父的信以来有多长时间了？

587. When was the last time he wrote you?
他最后一次写信给你是什么时候？

588. I can't recall how long it's been.
我回忆不起来有多久了。

589. I'm always disappointed when I don't get any mail.
接不到任何邮件时，我总感到失望。

590. I feel guilty because I haven't written her lately.
我感到内疚，因为我近来一直没有写信给她。

591. What time is the mail delivered on Saturday?
星期六的邮件是在什么时间投送的？

592. The postman always comes at 2 o'clock.
邮递员总是两点钟来。

593. I wrote to my uncle last night. I couldn't put it off any longer.
昨晚我给叔叔写了信。我不能再拖延了。

594. I enclosed some photographs in my letter.
我在信里附了几张照片。

595. I didn't know whether to send the letter airmail or not.
我不知道这封信是否要用航空发出。

596. How long does it take for a letter to get to California?
往加利福尼亚州寄信得多长时间？

597. Don't forget to put stamps on the letter before you mail it.
发信前别忘了贴邮票。

598. He went to the post office to mail a letter.
他到邮局寄信去了。

599. I dropped the letter in the mailbox on the corner.
我把信投入拐角处的邮筒里。

600. How did you sign the letter? Did you write, "Sincerely yours"?
你在信上是怎么署名的？你写上“忠实于您的”了吗？