like that ( this ) before 以前，之前

　　主要用作 not see ( feel, do ) anything like that ( this ) before 等形态，表示“没见过，没感觉过，没坐过”等表达方式，用于“吃惊”和“强调”。

　　例句：

　　Well, I have never seen anything like this before.

　　嗯，我从来没见过这种事情。

　　I've never felt like this before.

　　我从来没有过这种感觉。

　　I never did anything like that before.

　　我从来没做过那种事情。

　　I've seen things like this before.

　　我以前见过这种东西。

　　对话：

　　A: My stomach really hurts today.

　　今天胃好疼。

　　B: Have you ever felt like that before?

　　你之前疼过吗？