Word: 该 (gāi)

这才是我们该探究的。

Zhè cái shì wǒmen gāi tànjiū de.

That's what we intend to find out.

这束花凋谢了，该扔掉了。

Zhè shù huā diāoxièle, gāi rēngdiàole.

This bunch of flowers has wilted, so it's time to throw it out.

这条旧规定早就该废了。

Zhè tiáo jiù guīdìng zǎojiù gāi fèile.

This old rule should have been abolished long ago.

这真是我们该走的时候了。

Zhè zhēnshi wǒmen gāi zǒu de shíhou le.

It is really time for us to go.

这种问题该有补救办法。

Zhèzhǒng wèntí gāi yǒu bǔjiù bànfǎ.

This type of problem should be able to be solved.

这笔医药费该怎么筹措？

Zhè bǐ yīyào fèi gāi zěnme chóucuò?

How should we raise the money for these medical bills?

这辆车的胎该换了。

Zhè liàng chē de tāi gāi huàn le.

This car's tires need to be replaced.

那么晚了，该睡觉了。

Nàme wǎn le, gāi shuìjiàole.

It's so late; we should go to sleep.

那时我不知道该怎么办。

Nàshí wǒ bù zhīdào gāi zěnmebàn.

I didn't know what to do then.

那该让你高兴。

Nà gāi ràng nǐ gāoxìng.

That should make you happy.

问他下一步该做什么。

Wèn tā xià yíbù gāi zuò shénme.

Ask him what to do next.