草的复数是grasses。grasses的例句：The spring come，the flower and grasses all enjoyed the warmth of the sunlight（春天来了，花草都来享受阳光的温暖）。

grasses的例句：A sweet fragrance rose from the wild grasses（野草散发出芳香）；The lawn contained a mixture of grasses（草坪上生长着各种青草）。