翻译成英语：我们去看那部电影好么？ 对不起，我三天前就看过了

1楼是典型的中国式英语．
2楼只是问那部电影内容怎么样，没把意思表达出来．
所以我认为应该：
How about going to watch that movie?
Sorry, I watched it three days ago

We looked that movie is good? Sorry, I three days ago have looked.

How about the movie??
Sorry, I watched it three days ago.

How about going to see that movie?
Sorry, I saw it three days ago.