1. Time flies like an arrow!

2. Time flies in the blink of an eye.

3. What with singing and joking, the time passed quickly.

4. Time passes quickly.

5. An inch of time is an inch of gold.

6. Time flies, and years go by in the twinkle of an eye.

7. The best time to plant a tree was 20 years ago. The second best time is now.

8. Time is a river that flows eastward.

9. The days are long, the grass grows green, and the flowers bloom； but time flies and the years are gone.

10. Time is fleeting, like a shadow at dusk.

这些句子都以不同的方式表达了时间过得快的概念，既有形象的比喻，也有简洁的陈述。希望这些句子能满足你的需求。