One day, the father lets eight year-old son send a letter,?
有一天,父親讓八歲的兒子去寄一封信,

the son took the letter ,
兒子已經(jīng)拿著信跑了

the father then remembered didn't write the address and addressee's name on the envelope.
父親才想起信封上沒寫地址和收信人的名字。

After the son comes back, the father asks him: "You have thrown the letter in the mail box?"
兒子回來后,父親問他:“你把信丟進郵筒了嗎?”

"Certainly"“當然”

"You have not seen on the envelope not to write the address and the addressee name?"
“你沒看見信封上沒有寫地址和收信人名字嗎?”

"I certainly saw nothing written on the envelope."
“我當然看見信封上什么也沒寫”

"Then why you didn't take it back?"
“那你為什么不拿回來呢?”

"I also thought that you do not write the address and the addressee,“
我還以為你不寫地址和收信人,

is for does not want to let me know that you do send the letter to who!"
是為了不想讓我知道你把信寄給誰呢!”