绵羊的复数形式是sheep

例句

1.

The sheep are allowed to roam freely on this land.

绵羊可以在这片地上自由走动。

2.

The island is populated largely by sheep.

这个岛的主要生物是绵羊。

3.

Sheep's milk is produced in much the same way as goat's milk.

绵羊奶和山羊奶的生产过程差不多。