原文：

• When will it get delivered? I am leaving for a trip in 14 days, I would like to receive it before then.
• Does the 15 days include weekends? My trip is on August 14.
• One last question before confirming my order (thank you for your patience)....
• Please try to ship it out as soon as possible. It would be great if I receive it before August 14.

1.in 14 days

結(jié)合上下文會發(fā)現(xiàn)，意思是14天后。顧客14天后要去旅行，想在旅行前收到包裹。

2.on August 14 在具體某天用on

想起了這個順口溜：

in年in月in季，on日on節(jié)on某夜，at時分和深夜。年月季節(jié)都用in，一周兩周要用in，上午下午還是in。

3.It would be great if... 實用句型

in two days

百度上找到的如下：

1. 如果動作已經(jīng)發(fā)生，那么，in + 時間段：在......內(nèi)。例如：

He walked two hundred and sixty miles in eight days.

他在八天里走了二百六十英里。

2. 如果動作在將來發(fā)生，那么，in + 時間段：在......后。例如：

I'll have some breakfast ready in a few minutes.

我將在幾分鐘后把早餐準備好。

谷歌上找到的如下：

It does have both those meanings.它確實具有這兩個含義。

(i) = before 2 days have elapsed. 在2天過去之前。

(ii) = in two days' time (from now). 兩天后（從現(xiàn)在開始）。

in two days 和 within two days 的區(qū)別：

If today is Monday, and a company tells me:

如果今天是星期一，并且一家公司告訴我：

Your package will arrive in two days' time.

您的包裹將在兩天后到達。

then I will expect the package to arrive on Wednesday.

那么我預(yù)計包裹會在星期三到達。

However, if today is Monday, and a company tells me:

但是，如果今天是星期一，并且一家公司告訴我：

Your package will arrive within two days.

您的包裹將在兩天內(nèi)到達。

then I will expect the package to arrive on Tuesday or Wednesday.

那么我預(yù)計包裹會在星期二或星期三到達。

In other words, 'in two days' time' is typically a prediction, while 'within two days' specifies an upper limit.

換句話說，“in two days”通常是一個預(yù)測，而“within two days”指定上限。