你应该每天至少喝八杯水。

You ___should drink at least eight glasses of water every day.

我应该什么时候开始准备晚餐？

When ___should I start preparing dinner?

根据天气预报，明天应该会下雨。

According to the weather forecast, it ___should rain tomorrow.

万一下雨的话，我们就在室内活动。

If it ___should rain, we'll move the activity indoors.

我或许该去问问他的意见。

I ___should probably ask for his opinion.