WRONG:Write the report until 5 pm.

　　RIGHT: Write the report by 5 pm.

　　Write the report until 5 pm means “Start writing the report now, continue writing it until 5 pm, then stop writing it regardless of whether it is finished or not.”

　　當(dāng)你使用“until”意味著“從現(xiàn)在開始寫報(bào)告，一直寫，寫到下午五點(diǎn)，然后不管你寫沒寫完，都不能再寫了”。

　　Write the report by 5 pm means “Make sure that at 5 pm the letter is written and finished”.

　　當(dāng)你使用“by”就表示“確保一定要在下午五點(diǎn)前寫完這封信”。

　　Use “by” when you refer to a deadline.

　　使用“by”，你指的是一個(gè)最后期限。

　　Use “until” when you refer to the period of time before a deadline.

　　使用“until”，你指的是在最后期限之前的一段時(shí)間。

　　Here’s a summary:

　　總結(jié)：

　　1.I can do it by 5 pm.

　　我能在下午五點(diǎn)前做完。

　　2.I can do it until 5 pm.

　　我會(huì)做到下午五點(diǎn)(不管有沒有完成)。

　　3.I can’t do it by 5 pm.

　　下午五點(diǎn)前我做不完。

　　4.I can’t do it until 5 pm.

　　我要到下午五點(diǎn)才能開始做。