The sign on the grass mean 'Keep off the grass'改病句

问题描述:

The sign on the grass mean 'Keep off the grass'改病句

The sign on the grass (means) 'Keep off the grass'.
草地上的这个牌子意思是“勿践踏草地”.
错误在于谓语动词mean,因为主语是sign,为第三人称单数,动词要加s才对.