Word: 合理 (hélǐ)

他的意见很合理。

Tā de yìjiàn hěn hélǐ.

His opinion is reasonable.

他的要求很合理。

Tā de yāoqiú hěn hélǐ.

He is reasonable in his demands.

他的观点是合理的。

Tā de guāndiǎn shì hélǐ de.

His argument is rational.

你的建议似乎是合理的。

Nǐ de jiànyì sìhū shì hélǐ de.

Your suggestion seems reasonable.

你那样做是合理的。

Nǐ nàyàng zuò shì hélǐ de.

It's reasonable that you should do that.

我觉得挺合理的。

Wǒ juéde tǐng hélǐ de.

This makes sense to me.