We can water the grass.

我们可以浇草坪。

If it rains, the grass gets wet.

如果下雨，草会变湿。

They have a picnic on the grass.

他们在草地上野餐。

You should not walk on the grass.

你不应该在草地上行走。

Let's have a picnic on the grass.

让我们在草地上野餐吧。

The grass soon turned green again.

草很快又变绿了。

Robin is going to sit on the grass.

罗宾打算坐在草地上。

I should cut the grass this weekend.

我应该在这个周末割草。

The grass should be cut this weekend.

这个周末应该割草。

Then they have a picnic on the grass.

然后他们在草地上野餐。