These letters must be posted today.
这些信必须今天寄出。
I have written you a letter to be posted today.
我给你写了封信，在今天寄出。
The letter posted today will probably reach him tomorrow.
今天寄出的信或许明天他能收到。
A letter posted today will probably reach him the day after tomorrow.
今天发的信或许后天他能收到。
I posted the letter today in order that you could get it tomorrow.
为了使你明天能收到这封信，我今天去寄过了。
I posted the letter today in order that you'd get it tomorrow.
我今天把信发出，以便你明天能收到。
I remember having posted the letter today.
我记得今天把那封信发出去了。
Today, I posted a picture on Facebook.
今天我在Facebook上贴了张照片。
Today, I posted a picture on Facebook.
今天我在Facebook上贴了张照片。
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