形容词
1. I've been ill for the past three weeks. 我三周来一直在生病。
介词
1. The old man is past work. 那老头已干不了活了。
2. It is past my power. 这是我力所不及的。
名词
1. In the past he had to read by candlelight. 过去他只得在烛光下攻读。