1．作定语
And it was all because he happened to be the last kid in the last row.
这一切都因为他碰巧是坐在最后一排的最后一个孩子。
2．作状语
介词短语经常用来作状语，表时间、地点、原因、方式等。
Also imagine what it would be like spending the rest of your life with your eyes closed.
也要想象闭着眼睛度过余生会是什么样子。
3．作表语
He had no food or water and he was in terrible pain.
他没有东西吃，也没有水喝，而且疼得厉害。
