13. Have you stamped the letter with the right postage?
你貼郵票的郵資對嗎？
還能這樣說：
Has this letter been stamped with correct postage?
Have you put correct stamp on the letter?
應用解析：
with a stamp of impatience 不耐煩地一跺腳；
the stamp of the age 時代的特征；
bear the stamp of suffering 帶有受苦的痕跡
14. I didn't mail the letter to her, because I didn't have her address.
我沒有把那封信寄出，因為我沒有她的地址。
還能這樣說：
I didn't post the letter for lacking of her address.
I failed to mail the letter for I didn't know where she lived.
應用解析：
letter of recommendation 推薦書；介紹信；
letter of reference 調查信；保證書；
letter of regret 致歉信
15. Your letter is 30 grams overweight.
你的信超重30克。
還能這樣說：
Your letter weighs over 30 grams in excess of the allowance.
The excess weight of your letter is 30 grams.
16. What is the postage of this letter, please?
請問這封信的郵資是多少？
還能這樣說：
How much should I pay the postage of this letter?
How much is the postage of this letter?
諺語：
Don't put off till tomorrow what should be done today.
今日事，今日畢。
17. It will take only about 6 days to Beijing.
大概6天就能到北京了。
還能這樣說：
Your friend may receive your letter in about 6 days.
It needs about 6 days to Beijing.
應用解析：
reach one's hand 伸出手；
reach sb. sth. 遞給某人某物；
reach sb. a kick 踢某人；
reach toward sth. 伸向某物