“my favorite food is hamburger”里“hamburger”要不要加s?是“my favorite food is hamburger”对,还是“my favorite food is hamburgers”对?

问题描述:

“my favorite food is hamburger”里“hamburger”要不要加s?
是“my favorite food is hamburger”对,还是“my favorite food is hamburgers”对?

my favorite food is hamburgers 是对的,is与food 保持一致