corn 复数要加s不？有看到eat some corn 也有 eat some corns

都可以！

eat some corn

eat some corns

corns [k?:ns] n. 玉米（corn的复数）；

Corns are on sale in the supermarket this week.

这周超级市场的玉米在特价拍卖。

Can I have some more corn?

可以再给我一些玉米吗？