Can I use 已经 to talk about the future?
Can I use 已经 to talk about the future? For example if someone says lets do something on Thursday but you have already arranged to do it with them.

For example：A says; 今天我没时间上课，我们星期四或者星期五上课好吗？
Can I reply 星期四我们已经有课 We already have a class on Thursday.

Or maybe I have to say something like我们已经约定了星期四的课。

In English using Already to talk about the future is quite common : For example: Lets go the beach Sunday. No We are already going there on Saturday. But I don't think it is the same in Chinese, using already for the future, right?

Question

Can I use 已经 to talk about the future?
Can I use 已经 to talk about the future? For example if someone says lets do something on Thursday but you have already arranged to do it with them.

For example：A says; 今天我没时间上课，我们星期四或者星期五上课好吗？
Can I reply 星期四我们已经有课 We already have a class on Thursday.

Or maybe I have to say something like我们已经约定了星期四的课。
 
In English using Already to talk about the future is quite common : For example: Lets go the beach Sunday. No We are already going there on Saturday. But I don't think it is the same in Chinese, using already for the future, right?

Answer

Yes, you can.
-今天我没时间上课，我们星期五上课好吗？
-星期四我们已经有课了

Answer

you can say"星期四我们已经安排了课程或星期四我们有课。i am wondering about" already",i thought it only can be used in the sentence you 've done something already...is it correct if i say"we are here already" or we've reached here already...

Answer

再加几个例句：
100年后，人类可能已经在火星居住了
100年后，世界上可能已经没有国家的概念了

Answer

已經:副詞

1 所表示的時間為已過去
   爸爸已經回來了，正坐在客廳裡看新聞報導。
   荔枝上週已經銷售了三十公噸。

2 或者動作、狀況、事情在某時間之前完成。
   明年這個時候， 我女兒已經大學畢業了。
   荔枝到了下週就已經過了生產旺季了。

甲: 星期天我們去海邊吧！ (未來)
乙: 不，上星期六我們就已經去過那裡了。(過去， 意義一)
乙: 不，星期六我們已經就會在那裡了。(未來時間之前已完成， 意義二)

Answer

You can say it like that.
1.星期四我们已经有课  OR
2.我们已经约定了星期四的课( You can say,我们已经约好了星期四的课,it's better）
  
But for the dialogue you mentioned, use 星期四我们已经有课 better.