sheep的复数形式是什么

The path was no better than a sheep track.

那条小路简直就像是羊肠小道。

The sheep are allowed to roam freely on this land.

绵羊可以在这片地上自由走动。

At clipping time sheep need to be penned.

在剪羊毛时，需要把羊圈起来。

The island is populated largely by sheep.

这个岛的`主要生物是绵羊。

The minister preached a sermon on the parable of the lost sheep.

牧师讲道时用了亡羊的比喻。