fall
The leaves fall in autumn. 此句中fall用作动词,意为“落下,下降”,这是其常用法。fall还有其它用法。如:
①I had a fall and broke my arm. (fall用作名词,意为“跌落,掉下,降落”。)
②Our holiday plans fell through because of bad weather. (fall through 意为“落空,未能实现,成为泡影”。)
③My car is falling apart. (fall apart意为“破裂,破碎,散架”。)
④We fell about (laughing) when we heard the joke. (fall about意为“无法控制地大笑”。)
⑤Sam, please fall back on old friends in time of need. (fall back on意为“求助于,退到”。)

mind
Would you mind helping me? 此句中mind用作动词,意为“介意,注意”,这是mind的常用法之一。
 He has a mind for science. 此句中mind用作名词,意为“头脑,思维”,这是mind的常用法之二。
 mind除了以上用法外,还有其它用法。如: