587. How long has it been since you've heard from your daughter? 从你上次接到你女儿的信以来有多长时间了？ 

588. I can't recall how long it has been. 我回忆不起来多长时间了。 

589. I often send emails to my friends who are abroad. 我经常给在国外的朋友发电子邮件。 

590. I am sorry to have delayed writing back to you. 耽误了给你的回信，很抱歉。 

591. She is disappointed because she doesn't get any letter from her boyfriend. 她没有收到男朋友的信，很失望。 

592. I enclosed my resume in my letter. 我在信里附上了我的简历。 

593. What time is the mail delivered on Sunday? 星期天的邮件都是在什么时间投送的？ 

594. The postman always comes at 12 o'clock. 邮递员总是12点来。 

595. I wrote to my father last night. I couldn't put it off any longer. 我昨晚给父亲写信了，我不能再拖延了。 

596. What's the postage on these letters to India, please? 请问这些信寄到印度邮费是多少？ 

597. I'd like to send this letter registered. 我想挂号邮寄这封信。 

598. I don'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。 

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

600. He dropped the letter in the mailbox. 他把信投入了邮筒。